Why Is My Heat Pump Showing A Low Flow Fault?
Why Is My Heat Pump Showing A Low Flow Fault?
Why Is My Heat Pump Showing A Low Flow Fault?
Why Is My Heat Pump Showing A Low Flow Fault?
Why Is My Heat Pump Showing A Low Flow Fault?
UK Heat pump Help Technical Team
Independent Heat Pump Engineer
Why Is My Heat Pump Showing A Low Flow Fault?
A low flow fault is one of the most frequently displayed fault codes on UK air source heat pumps. When this fault appears, your system is telling you that water is not circulating through the heating circuit at the rate required for the heat pump to operate safely and efficiently.
The heat pump responds by shutting down to protect itself, specifically to prevent the compressor and heat exchanger from reaching temperatures that could cause lasting damage. This is a protective response, not a failure. The cause could be anything from a blocked filter you can clean in twenty minutes to a circulation pump that needs replacing.
This guide explains exactly what a low flow fault means, works through every common cause in order of likelihood, and tells you what to check before calling an engineer. In most cases, the fault is identifiable and resolvable without replacing any major components.
What Does A Low Flow Fault Mean?
Heat pumps continuously monitor water movement through the primary heating circuit using a flow switch, a flow sensor, or both. The controller compares the measured flow rate against the manufacturer’s configured minimum, typically somewhere between 12 and 30 litres per minute for a domestic UK installation, depending on the heat pump model and system volume.
When the measured flow drops below this threshold, even momentarily on some systems, the controller logs a fault and shuts the heat pump down. Without adequate water flow through the plate heat exchanger, the refrigerant circuit cannot transfer heat efficiently into the heating system, causing pressure and temperature to rise inside the unit.
Different manufacturers name this fault differently. Common descriptions across UK heat pump brands include:
Low flow fault, commonly shown on Vaillant aroCOLLECT and aroPLUS systems
Flow switch fault, frequently seen on Samsung and LG heat pump controllers
Insufficient circulation, used by some Daikin Altherma systems
Water flow error, a generic term appearing across multiple brands and models
Circulation fault, sometimes displayed on Mitsubishi Ecodan systems
Regardless of the specific code or wording, the underlying issue is the same: the heat pump is not receiving enough water circulation. For a detailed explanation of what these codes mean on specific brands and what typically triggers them on each model, our guide on why your heat pump is showing a flow error covers this in detail by brand and system type.
What Causes A Low Flow Fault?
Several different problems can cause water flow to drop below the heat pump’s minimum requirement. Some are straightforward to identify and resolve yourself. Others require a qualified engineer. The following causes are listed in order of how commonly we encounter them in UK installations.
Dirty System Filters
This is the most frequent cause of low flow faults we encounter, and the most often overlooked. Heat pump systems accumulate debris over time: small particles dislodged from pipework, residue from flux used during installation, and magnetite, a black iron oxide that forms when oxygen reacts with ferrous components inside the circuit.
Most systems include a magnetic system filter, a Y-strainer, or an inline mesh strainer, sometimes all three, specifically to capture this debris before it reaches sensitive components. As these filters become loaded with magnetite and debris, the restriction they create increases, gradually reducing the flow rate until it drops below the minimum required and the heat pump faults.
The signs of a blocked filter are often subtle in the early stages: slightly less effective heating, a heat pump that runs for longer periods than it used to, or a fault that appears on particularly cold or demanding days and then disappears again in milder conditions. Cleaning the magnetic filter, which takes around twenty minutes once you know where it is located, resolves a large proportion of low flow faults entirely.
For a full explanation of how system debris affects heat pump performance beyond just flow faults, including the impact on efficiency, running costs, and component lifespan, our article on how dirty filters cause heat pump problems explains what to look for and how often filters should be inspected.
Low System Pressure
A system operating below its minimum pressure will struggle to circulate water reliably. For most domestic UK heat pump installations, normal cold system pressure sits between 1.0 and 2.0 bar. Most installers target around 1.5 bar at commissioning. Below 1.0 bar, many systems develop circulation problems that can directly trigger a flow fault.
Low pressure is usually caused by a small water leak, which does not need to be a visible drip, a failed expansion vessel, or water loss during recent maintenance work. If you find yourself needing to top up the system repeatedly, the underlying cause of why pressure keeps dropping needs identifying. Simply adding water masks the problem and introduces excess oxygen into the closed system, which accelerates corrosion over time.
It is worth noting that a low pressure fault and a low flow fault can appear together on some controllers; they may share the same root cause, or the pressure may have dropped severely enough to impair circulation independently of other factors.
Closed Valves
Restrictions created by closed or partially closed valves are a more common cause of low flow faults than most homeowners expect, and one of the easiest to miss, because everything can appear correct from the outside.
Common valve-related causes we encounter in UK installations include:
Isolation valves left partially closed after maintenance or the original installation, particularly on the flow and return connections near the heat pump itself
Thermostatic radiator valves (TRVs) turned too low in multiple rooms simultaneously, which reduces total system flow across the whole circuit
Zone valves that have failed in the closed position, preventing flow through an entire heating circuit even though the heat pump is running
With heat pumps in particular, turning TRVs down in several rooms at once can reduce total circuit flow well below the minimum required, especially on systems without a buffer tank or volumiser to absorb the reduced demand. This is a more significant issue for heat pumps than it ever was for gas boilers.
Air Within The System
Air pockets within the heating circuit can partially block sections of pipework and reduce effective circulation. Unlike a solid blockage, air locks tend to create intermittent problems. The fault can appear and disappear as air shifts position within the pipes, which makes diagnosis more challenging.
Indicators that trapped air may be contributing to a low flow fault include:
Gurgling or rushing sounds from pipework or the heat pump unit, particularly during or after a defrost cycle
Uneven heating, with some radiators warming well while others take much longer or stay cold
A pressure gauge that fluctuates more than expected during normal system operation
A flow fault that resets immediately but returns again after only a short period of operation
Bleeding the highest radiators in the property first and then working downward usually clears air locks. If the problem returns after a few days, air is likely re-entering through a leak or a faulty automatic air vent rather than being residual from the initial fill.
Circulation Pump Problems
Heat pump systems use one or more dedicated circulation pumps to drive water around the heating circuit. If the primary pump fails, runs at too low a speed setting, seizes internally, or is wired incorrectly, flow rates will drop below the heat pump’s minimum requirement.
A pump problem does not always mean complete failure. The pump can also degrade gradually, providing adequate circulation during mild weather but not enough when heating demand peaks in cold conditions. This is why some low flow faults only appear in winter while everything seems fine during a summer or autumn commissioning check.
Diagnosing circulation pump issues properly requires measuring actual flow rate and checking pump head pressure; neither is straightforward without the right equipment. If the system filters are clean, pressure is correct, all valves are fully open, and the fault persists, the pump is the logical next component to investigate with an engineer.
Blocked Pipework Or Components
In older heating systems, or in systems that have been running without a magnetic filter for several years, sludge and magnetite can accumulate within radiators, pipework, and heat exchangers to the point where they create a measurable restriction to water flow, not just reducing efficiency, but eventually triggering flow faults.
Magnetite and sludge accumulation in radiator sections and pipework bends
Installation debris: swarf, flux residue, or jointing compound that was not fully purged from the circuit at commissioning
A partially blocked plate heat exchanger inside the heat pump unit, a component most homeowners never see and installers rarely check
Y-strainers or inline mesh strainers that have accumulated debris and not been inspected
Sludge-related flow restrictions are often progressive. The system performs adequately in the first year or two but gradually deteriorates as debris accumulates. A powerflush followed by refilling with the correct inhibitor concentration can often restore adequate flow, though the underlying reason sludge formed in the first place, typically an absence of adequate system filtration, also needs addressing to prevent recurrence.
Can A Low Flow Fault Damage A Heat Pump?
If left unresolved over time, yes. The automatic shutdown the fault triggers is specifically designed to prevent lasting damage, but repeated fault cycles without addressing the underlying cause still place stress on components that were not designed for that operating pattern.
A heat pump transfers energy from the outdoor air into the heating circuit via a refrigerant loop and plate heat exchanger. Water flowing through the heat exchanger is what carries that energy away. Without sufficient water movement, the refrigerant cannot transfer heat efficiently. Pressure builds in the refrigerant circuit and temperatures rise inside the unit.
If this goes unchecked, high refrigerant pressure can damage the compressor, the most expensive component in the system, and the one that most commonly determines whether a heat pump is repairable or needs replacing. The fault code and automatic shutdown exist to protect the compressor, not because the compressor has already been damaged.
This is also why resetting a low flow fault and continuing to run the system without investigating the cause carries real risk. A single fault reset and monitored is usually fine. A fault reset five times in an afternoon, or reset daily for a week, is placing repeated stress on components that were not designed for that operating pattern.
The fault is a warning that something needs attention. It is not an instruction to reset and wait. Act on it.
Should I Just Reset The Fault?
Resetting the fault once to see whether it returns is a reasonable first step, as it provides useful information. If the fault clears and does not come back, the cause may have been transient: a brief air lock, a momentary pressure drop, or a debris particle that passed through the system.
If the fault returns within minutes, hours, or by the following morning, resetting it again without investigating the cause is unlikely to help and may mask a developing problem.
The fault pattern itself gives you useful diagnostic signals. A fault that appears only on cold mornings but clears by mid-morning often suggests a near-marginal flow situation where the system is just about adequate in mild conditions but cannot meet demand when it is at its highest. A fault that returns every time the heat pump starts suggests a consistent restriction that does not self-clear.
In both cases, the starting point is identifying the cause rather than resetting. The checks in the next section will help you narrow down where to look.
What Should I Check First?
If your heat pump is displaying a low flow fault, work through these checks in order. Many faults at this level are resolvable without a site visit, and running through these steps first will also give an engineer useful information if you do need to call one out:
Check the system pressure gauge. It should sit between 1.0 and 2.0 bar when the system is cold and at rest. If it is below 1.0 bar, top up using the filling loop and then monitor it over the next 24 hours to see whether it holds or continues to fall.
Check every isolation valve and zone valve in the plant room. Ball valves should have the handle running inline (parallel to the pipe) to be fully open. Any valve with the handle at a right angle to the pipe is closed. Ensure the flow and return connections at the heat pump are both fully open.
Walk around every radiator in the property and feel each one for warmth. Any that are completely cold while others are warm may indicate a localised restriction, a TRV stuck in the closed position, or a flow imbalance across the circuit.
Listen carefully for gurgling or air-movement sounds from pipework; bleed the highest radiators in the property first, then work downward through each floor. Remember to top up the system pressure afterwards if it drops during the bleeding process.
Inspect the magnetic filter. Locate it on the pipework (typically in the plant room, usually below the heat pump) and check when it was last cleaned. If it has not been serviced in the past 12 months, or if this has never been done, clean it before anything else. This single step resolves a significant percentage of recurring low flow faults.
If none of these steps identifies the cause, the fault is likely to be further into the system: the circulation pump, the hydraulic layout, or a design issue that requires a more structured technical review.
When Should You Seek Help?
If you have worked through the initial checks and the fault persists, or if any of the following apply, it is worth seeking an independent technical review rather than continuing to reset and wait:
The fault returns within hours of being cleared, even after checking pressure, filters, and all valves
The heating has stopped completely and cannot be restored by resetting; the system shuts down immediately each time it is started
System pressure continues falling after you top it up, indicating an active leak somewhere in the circuit rather than a one-off loss
The magnetic filter was cleaned recently but the fault has returned, confirming the cause lies elsewhere in the system
The circulation pump is audible but the fault persists; the pump may be running at the wrong speed or producing insufficient flow even though it has not failed outright
Persistent low flow faults that survive the initial checks usually require a more structured diagnosis, looking at actual flow rates, pump head settings, hydraulic layout, and original commissioning data. Errors made during the original commissioning are among the most common root causes we identify when homeowners have been chasing the same fault for months. Our article on why some heat pump systems struggle to circulate through radiators explores the hydraulic causes that a simple fault reset will never resolve.
Need Help Diagnosing A Low Flow Fault?
If your heat pump keeps showing a low flow fault and you are struggling to identify the cause, our Fix My Heat Pump service can identify the actual cause before you spend money on unnecessary parts or call-outs.
We review photographs, fault history, pressure readings, filter condition, and system configuration remotely, giving you a specific answer to what is actually causing the fault rather than a generic checklist.
If you are still planning a heat pump installation, many low flow issues are avoidable by ensuring the pipework sizing, system volume, emitter design, and hydraulic layout are correct before work begins. Our Pre-Installation Review service reviews the proposed design, identifies hydraulic weaknesses, and checks that the system will meet the heat pump’s minimum flow requirements before anything is installed.
Why Is My Heat Pump Showing A Low Flow Fault?
A low flow fault is one of the most frequently displayed fault codes on UK air source heat pumps. When this fault appears, your system is telling you that water is not circulating through the heating circuit at the rate required for the heat pump to operate safely and efficiently.
The heat pump responds by shutting down to protect itself, specifically to prevent the compressor and heat exchanger from reaching temperatures that could cause lasting damage. This is a protective response, not a failure. The cause could be anything from a blocked filter you can clean in twenty minutes to a circulation pump that needs replacing.
This guide explains exactly what a low flow fault means, works through every common cause in order of likelihood, and tells you what to check before calling an engineer. In most cases, the fault is identifiable and resolvable without replacing any major components.
What Does A Low Flow Fault Mean?
Heat pumps continuously monitor water movement through the primary heating circuit using a flow switch, a flow sensor, or both. The controller compares the measured flow rate against the manufacturer’s configured minimum, typically somewhere between 12 and 30 litres per minute for a domestic UK installation, depending on the heat pump model and system volume.
When the measured flow drops below this threshold, even momentarily on some systems, the controller logs a fault and shuts the heat pump down. Without adequate water flow through the plate heat exchanger, the refrigerant circuit cannot transfer heat efficiently into the heating system, causing pressure and temperature to rise inside the unit.
Different manufacturers name this fault differently. Common descriptions across UK heat pump brands include:
Low flow fault, commonly shown on Vaillant aroCOLLECT and aroPLUS systems
Flow switch fault, frequently seen on Samsung and LG heat pump controllers
Insufficient circulation, used by some Daikin Altherma systems
Water flow error, a generic term appearing across multiple brands and models
Circulation fault, sometimes displayed on Mitsubishi Ecodan systems
Regardless of the specific code or wording, the underlying issue is the same: the heat pump is not receiving enough water circulation. For a detailed explanation of what these codes mean on specific brands and what typically triggers them on each model, our guide on why your heat pump is showing a flow error covers this in detail by brand and system type.
What Causes A Low Flow Fault?
Several different problems can cause water flow to drop below the heat pump’s minimum requirement. Some are straightforward to identify and resolve yourself. Others require a qualified engineer. The following causes are listed in order of how commonly we encounter them in UK installations.
Dirty System Filters
This is the most frequent cause of low flow faults we encounter, and the most often overlooked. Heat pump systems accumulate debris over time: small particles dislodged from pipework, residue from flux used during installation, and magnetite, a black iron oxide that forms when oxygen reacts with ferrous components inside the circuit.
Most systems include a magnetic system filter, a Y-strainer, or an inline mesh strainer, sometimes all three, specifically to capture this debris before it reaches sensitive components. As these filters become loaded with magnetite and debris, the restriction they create increases, gradually reducing the flow rate until it drops below the minimum required and the heat pump faults.
The signs of a blocked filter are often subtle in the early stages: slightly less effective heating, a heat pump that runs for longer periods than it used to, or a fault that appears on particularly cold or demanding days and then disappears again in milder conditions. Cleaning the magnetic filter, which takes around twenty minutes once you know where it is located, resolves a large proportion of low flow faults entirely.
For a full explanation of how system debris affects heat pump performance beyond just flow faults, including the impact on efficiency, running costs, and component lifespan, our article on how dirty filters cause heat pump problems explains what to look for and how often filters should be inspected.
Low System Pressure
A system operating below its minimum pressure will struggle to circulate water reliably. For most domestic UK heat pump installations, normal cold system pressure sits between 1.0 and 2.0 bar. Most installers target around 1.5 bar at commissioning. Below 1.0 bar, many systems develop circulation problems that can directly trigger a flow fault.
Low pressure is usually caused by a small water leak, which does not need to be a visible drip, a failed expansion vessel, or water loss during recent maintenance work. If you find yourself needing to top up the system repeatedly, the underlying cause of why pressure keeps dropping needs identifying. Simply adding water masks the problem and introduces excess oxygen into the closed system, which accelerates corrosion over time.
It is worth noting that a low pressure fault and a low flow fault can appear together on some controllers; they may share the same root cause, or the pressure may have dropped severely enough to impair circulation independently of other factors.
Closed Valves
Restrictions created by closed or partially closed valves are a more common cause of low flow faults than most homeowners expect, and one of the easiest to miss, because everything can appear correct from the outside.
Common valve-related causes we encounter in UK installations include:
Isolation valves left partially closed after maintenance or the original installation, particularly on the flow and return connections near the heat pump itself
Thermostatic radiator valves (TRVs) turned too low in multiple rooms simultaneously, which reduces total system flow across the whole circuit
Zone valves that have failed in the closed position, preventing flow through an entire heating circuit even though the heat pump is running
With heat pumps in particular, turning TRVs down in several rooms at once can reduce total circuit flow well below the minimum required, especially on systems without a buffer tank or volumiser to absorb the reduced demand. This is a more significant issue for heat pumps than it ever was for gas boilers.
Air Within The System
Air pockets within the heating circuit can partially block sections of pipework and reduce effective circulation. Unlike a solid blockage, air locks tend to create intermittent problems. The fault can appear and disappear as air shifts position within the pipes, which makes diagnosis more challenging.
Indicators that trapped air may be contributing to a low flow fault include:
Gurgling or rushing sounds from pipework or the heat pump unit, particularly during or after a defrost cycle
Uneven heating, with some radiators warming well while others take much longer or stay cold
A pressure gauge that fluctuates more than expected during normal system operation
A flow fault that resets immediately but returns again after only a short period of operation
Bleeding the highest radiators in the property first and then working downward usually clears air locks. If the problem returns after a few days, air is likely re-entering through a leak or a faulty automatic air vent rather than being residual from the initial fill.
Circulation Pump Problems
Heat pump systems use one or more dedicated circulation pumps to drive water around the heating circuit. If the primary pump fails, runs at too low a speed setting, seizes internally, or is wired incorrectly, flow rates will drop below the heat pump’s minimum requirement.
A pump problem does not always mean complete failure. The pump can also degrade gradually, providing adequate circulation during mild weather but not enough when heating demand peaks in cold conditions. This is why some low flow faults only appear in winter while everything seems fine during a summer or autumn commissioning check.
Diagnosing circulation pump issues properly requires measuring actual flow rate and checking pump head pressure; neither is straightforward without the right equipment. If the system filters are clean, pressure is correct, all valves are fully open, and the fault persists, the pump is the logical next component to investigate with an engineer.
Blocked Pipework Or Components
In older heating systems, or in systems that have been running without a magnetic filter for several years, sludge and magnetite can accumulate within radiators, pipework, and heat exchangers to the point where they create a measurable restriction to water flow, not just reducing efficiency, but eventually triggering flow faults.
Magnetite and sludge accumulation in radiator sections and pipework bends
Installation debris: swarf, flux residue, or jointing compound that was not fully purged from the circuit at commissioning
A partially blocked plate heat exchanger inside the heat pump unit, a component most homeowners never see and installers rarely check
Y-strainers or inline mesh strainers that have accumulated debris and not been inspected
Sludge-related flow restrictions are often progressive. The system performs adequately in the first year or two but gradually deteriorates as debris accumulates. A powerflush followed by refilling with the correct inhibitor concentration can often restore adequate flow, though the underlying reason sludge formed in the first place, typically an absence of adequate system filtration, also needs addressing to prevent recurrence.
Can A Low Flow Fault Damage A Heat Pump?
If left unresolved over time, yes. The automatic shutdown the fault triggers is specifically designed to prevent lasting damage, but repeated fault cycles without addressing the underlying cause still place stress on components that were not designed for that operating pattern.
A heat pump transfers energy from the outdoor air into the heating circuit via a refrigerant loop and plate heat exchanger. Water flowing through the heat exchanger is what carries that energy away. Without sufficient water movement, the refrigerant cannot transfer heat efficiently. Pressure builds in the refrigerant circuit and temperatures rise inside the unit.
If this goes unchecked, high refrigerant pressure can damage the compressor, the most expensive component in the system, and the one that most commonly determines whether a heat pump is repairable or needs replacing. The fault code and automatic shutdown exist to protect the compressor, not because the compressor has already been damaged.
This is also why resetting a low flow fault and continuing to run the system without investigating the cause carries real risk. A single fault reset and monitored is usually fine. A fault reset five times in an afternoon, or reset daily for a week, is placing repeated stress on components that were not designed for that operating pattern.
The fault is a warning that something needs attention. It is not an instruction to reset and wait. Act on it.
Should I Just Reset The Fault?
Resetting the fault once to see whether it returns is a reasonable first step, as it provides useful information. If the fault clears and does not come back, the cause may have been transient: a brief air lock, a momentary pressure drop, or a debris particle that passed through the system.
If the fault returns within minutes, hours, or by the following morning, resetting it again without investigating the cause is unlikely to help and may mask a developing problem.
The fault pattern itself gives you useful diagnostic signals. A fault that appears only on cold mornings but clears by mid-morning often suggests a near-marginal flow situation where the system is just about adequate in mild conditions but cannot meet demand when it is at its highest. A fault that returns every time the heat pump starts suggests a consistent restriction that does not self-clear.
In both cases, the starting point is identifying the cause rather than resetting. The checks in the next section will help you narrow down where to look.
What Should I Check First?
If your heat pump is displaying a low flow fault, work through these checks in order. Many faults at this level are resolvable without a site visit, and running through these steps first will also give an engineer useful information if you do need to call one out:
Check the system pressure gauge. It should sit between 1.0 and 2.0 bar when the system is cold and at rest. If it is below 1.0 bar, top up using the filling loop and then monitor it over the next 24 hours to see whether it holds or continues to fall.
Check every isolation valve and zone valve in the plant room. Ball valves should have the handle running inline (parallel to the pipe) to be fully open. Any valve with the handle at a right angle to the pipe is closed. Ensure the flow and return connections at the heat pump are both fully open.
Walk around every radiator in the property and feel each one for warmth. Any that are completely cold while others are warm may indicate a localised restriction, a TRV stuck in the closed position, or a flow imbalance across the circuit.
Listen carefully for gurgling or air-movement sounds from pipework; bleed the highest radiators in the property first, then work downward through each floor. Remember to top up the system pressure afterwards if it drops during the bleeding process.
Inspect the magnetic filter. Locate it on the pipework (typically in the plant room, usually below the heat pump) and check when it was last cleaned. If it has not been serviced in the past 12 months, or if this has never been done, clean it before anything else. This single step resolves a significant percentage of recurring low flow faults.
If none of these steps identifies the cause, the fault is likely to be further into the system: the circulation pump, the hydraulic layout, or a design issue that requires a more structured technical review.
When Should You Seek Help?
If you have worked through the initial checks and the fault persists, or if any of the following apply, it is worth seeking an independent technical review rather than continuing to reset and wait:
The fault returns within hours of being cleared, even after checking pressure, filters, and all valves
The heating has stopped completely and cannot be restored by resetting; the system shuts down immediately each time it is started
System pressure continues falling after you top it up, indicating an active leak somewhere in the circuit rather than a one-off loss
The magnetic filter was cleaned recently but the fault has returned, confirming the cause lies elsewhere in the system
The circulation pump is audible but the fault persists; the pump may be running at the wrong speed or producing insufficient flow even though it has not failed outright
Persistent low flow faults that survive the initial checks usually require a more structured diagnosis, looking at actual flow rates, pump head settings, hydraulic layout, and original commissioning data. Errors made during the original commissioning are among the most common root causes we identify when homeowners have been chasing the same fault for months. Our article on why some heat pump systems struggle to circulate through radiators explores the hydraulic causes that a simple fault reset will never resolve.
Need Help Diagnosing A Low Flow Fault?
If your heat pump keeps showing a low flow fault and you are struggling to identify the cause, our Fix My Heat Pump service can identify the actual cause before you spend money on unnecessary parts or call-outs.
We review photographs, fault history, pressure readings, filter condition, and system configuration remotely, giving you a specific answer to what is actually causing the fault rather than a generic checklist.
If you are still planning a heat pump installation, many low flow issues are avoidable by ensuring the pipework sizing, system volume, emitter design, and hydraulic layout are correct before work begins. Our Pre-Installation Review service reviews the proposed design, identifies hydraulic weaknesses, and checks that the system will meet the heat pump’s minimum flow requirements before anything is installed.
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If you're unsure whether your heat pump problem can be diagnosed remotely, send us a short description of the issue and we’ll let you know if a technical review is worthwhile. No obligation.
If you're unsure whether your heat pump problem can be diagnosed remotely, send us a short description of the issue and we’ll let you know if a technical review is worthwhile. No obligation.
If you're unsure whether your heat pump problem can be diagnosed remotely, send us a short description of the issue and we’ll let you know if a technical review is worthwhile. No obligation.
