Heat Pump Repair in Cambridge
Find your symptom below for the likely causes and what to do next. Cambridge's frosty winters and chalk water each leave their mark on heat pumps, and most problems have a straightforward fix.
Last reviewed: 2 October 2026
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Frost is normal; stuck ice isn't
with around 52 frosty nights a year in Cambridge, short defrost cycles are routine. Ice that stays on the coil is the thing to report.
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Hard water shows up first
Cambridge's chalk water scales cylinder coils, so slow hot water is one of the most common symptoms locally.
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Diagnosis before parts
a diagnostic visit reads the system's fault log and pressures so you only pay for the part that's actually needed.
Find your symptom
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No heating or hot water at all
Likely causes: a tripped breaker, a controller fault, or a safety lockout. First check the heat pump's breaker in the consumer unit and note any error code. If the breaker trips again after one reset, leave it off.
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Outdoor unit covered in ice that doesn't clear
Likely causes: a failed defrost sensor, a fan that has stopped, low refrigerant, or meltwater refreezing because it can't drain away. Common to spot after a run of Cambridge frosts. Get it checked, because running with a blocked coil strains the compressor.
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Hot water lukewarm or slow to reheat
Likely causes: scale on the cylinder coil from Cambridge's very hard water (around 286–295 mg/l), a faulty cylinder sensor or a changed schedule. Descaling and a scale reducer usually help.
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Some rooms cold, others fine
Likely causes: air in radiators, a stuck thermostatic valve, an unbalanced system or a blocked filter. Usually a quick fix during a visit.
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A new rattle, hum or grinding noise
Likely causes: a worn fan bearing, a loose panel or debris in the fan. Worth acting on early.
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Electricity use has crept up
Likely causes: reduced efficiency from a dirty coil, low refrigerant, a drifted sensor or a heating curve set too high. An engineer compares readings with the commissioning record.
Repair costs in Cambridge
Most repairs start with a diagnostic visit, typically £80–£150. The engineer reads the controller's fault history, checks pressures and temperatures, and tells you what's wrong before quoting for parts.
- Minor parts — sensors, valves, seals: about £15–£200 plus labour
- Mid-range parts — fan motor, expansion valve, control board: about £200–£600 plus labour
- Major parts — compressor: £800–£2,500+ plus labour
Parts may be covered by the manufacturer's warranty if the system has been serviced annually. Keep your MCS certificate and service records together so the engineer can check.
Arranging a repair
Send us a short description through the form on our homepage. A local heat pump engineer from our network will be in touch. It helps to include the brand and model, any error code, when the problem began, and whether you're a homeowner, landlord or tenant.
Brands commonly found in Cambridge homes:
- Mitsubishi Electric Ecodan
- Daikin Altherma
- Vaillant aroTHERM
- Grant Aerona
- Samsung EHS
- LG Therma V
Common questions about repairs
Is it normal for my heat pump to steam in the morning?
Yes. On cold, damp mornings, frost forms on the outdoor coil and the heat pump briefly reverses to melt it, releasing steam and water. This is a defrost cycle and takes a few minutes. It's only a problem if ice builds up and doesn't clear.
How much does a heat pump repair cost in Cambridge?
A diagnostic visit is typically around £80–£150. Parts vary: sensors and valves might be £15–£200 plus labour, fan motors and control boards £200–£600, and a compressor £800–£2,500 or more. You should get a written quote before any parts are ordered.
My landlord's heat pump isn't working. What should I do?
Tell your landlord straight away, with any error code shown on the controller. Repairs to heating in a rented home are the landlord's responsibility. In the meantime, an immersion heater in the cylinder, if fitted, can provide hot water.
Can I clear ice off the outdoor unit myself?
Don't chip or scrape it, as the fins are delicate. If it isn't clearing on its own, switch the unit off at the isolator and arrange a visit. You can safely clear snow drifts and leaves from around the unit.
Who can repair a heat pump?
An engineer trained on heat pumps, ideally familiar with your brand. Any work on the sealed refrigerant circuit legally requires F-Gas certification.
Will repairs affect my warranty?
Warranty cover usually continues if repairs are done by a suitably qualified engineer and your annual service record is up to date. Check your warranty terms and keep every service and repair record.
Request a heat pump repair visit
Describe the symptom and any error code. A local heat pump engineer from our network will be in touch to arrange a visit.