Heat pump repair is the diagnosis and fixing of faults in an air source heat pump, its water circuit, its controls or the hot water cylinder. Many faults have a simple cause, such as low system pressure, a blocked filter or a control setting, while others involve a failed sensor, pump, fan or circuit board.
Heat pump owners in Gwynedd can arrange a fault-finding visit at a rate agreed before an engineer attends. We repair heat pumps in Gwynedd whoever installed them, including older monobloc and split systems. For repeated faults in Gwynedd, the engineer looks at the system design as well as the failed part.
Who it suits
- Heat pumps installed by another company that need a second opinion
- Heat pumps showing an error code or fault light
- Systems losing pressure or needing frequent topping up
- Outdoor units that have become noisy, iced up or keep switching on and off
Grants and rules for heat pumps in Wales
In Wales the Boiler Upgrade Scheme gives £7,500 towards an air source heat pump (£9,000 if it replaces oil or LPG, from 21 July 2026 to 31 March 2027; £2,500 for air-to-air). The MCS-certified installer named in your quote applies to Ofgem for you, and the grant comes off your quote.
Heat pump repairs prices in Gwynedd
These are guide prices including VAT. The rate for your visit in Gwynedd is confirmed before we book it, and any repair is priced in writing before parts are ordered.
| Repair | Guide price |
|---|---|
| Fault-finding visit and diagnosis | £90–£180 |
| Sensor or thermistor replacement | £120–£280 |
| Expansion vessel or pressure relief valve | £150–£350 |
| Circulating pump replacement | £250–£480 |
| Fan motor replacement | £300–£650 |
| Refrigerant leak repair and re-gas (split systems) | £350–£950 |
| Main control board (PCB) replacement | £450–£1,100 |
Inc VAT. The fault-finding rate is agreed before we attend; repairs are priced in writing before parts are ordered.
Towns we cover in Gwynedd
We cover 9 towns in Gwynedd for heat pump repairs. Each links to local guide prices and the grant position for Wales.
| Town | Postcode district | Nearest town | Midwinter daylight |
|---|---|---|---|
| Bangor (Gwynedd) | LL59 | Beaumaris | 7 h 31 min |
| Bala | LL23 | Dolgellau | 7 h 35 min |
| Beaumaris | LL58 | Bangor (Gwynedd) | 7 h 31 min |
| Caernarfon | LL55 | Llangefni | 7 h 32 min |
| Dolgellau | LL40 | Machynlleth | 7 h 36 min |
| Holyhead | LL65 | Llangefni | 7 h 30 min |
| Llangefni | LL77 | Bangor (Gwynedd) | 7 h 31 min |
| Porthmadog | LL49 | Pwllheli | 7 h 34 min |
| Pwllheli | LL53 | Porthmadog | 7 h 35 min |
Heat pump repairs questions
Why is my heat pump showing an error code?
An error code is the heat pump's way of reporting a problem it has detected, such as low water flow, a sensor reading out of range or a communication fault between units. Note the code and check the manual, as some codes clear after a simple reset or pressure top-up. If it returns, an engineer can trace the underlying cause.
How much does a heat pump repair cost?
Heat pump repairs have a typical range of £90–£1,100, including VAT, depending on the part and labour involved. Sensor replacements sit at the lower end, while control boards and refrigerant repairs on split systems sit higher. Every repair starts with a fault-finding visit, with a guide price of £90–£180 for the first hour, and the repair is priced before work goes ahead.
Is ice on my heat pump a fault?
Some frost on the outdoor unit in cold, damp weather is normal, and the unit clears it with regular defrost cycles, often releasing a little vapour. It becomes a fault when thick ice builds up and does not clear, or when ice blocks the fan. That can point to poor airflow, a failed sensor, drainage problems or low refrigerant, and needs checking.
Can you repair a heat pump installed by another company?
Yes. We carry out fault-finding and repairs on heat pumps installed by other companies, including monobloc and split systems. Tell us the make, model and approximate age when you get in touch, plus any error code shown. If the system is still under the manufacturer's warranty, it may be quicker to contact the original installer or manufacturer first.