Typical repairs fall within a guide range of £90–£1,100, including VAT, depending on the part and the time involved. Refrigerant repairs must be done by an F-gas certified engineer. Regular heat pump servicing catches many of these faults before they stop the system working.
For repeated faults in Gwent, the engineer looks at the system design as well as the failed part. Heat pump owners in Gwent can arrange a fault-finding visit at a rate agreed before an engineer attends. Across Gwent and Gwent, refrigerant repairs on split systems are carried out by an F-gas certified engineer.
Who it suits
- Heat pumps showing an error code or fault light
- Systems losing pressure or needing frequent topping up
- Rooms or hot water not getting warm enough
- Heat pumps installed by another company that need a second opinion
Grants and rules for heat pumps in Wales
Homes in Gwent can use the Boiler Upgrade Scheme, which applies in Wales as well as England: £7,500 towards an air source heat pump, or £9,000 when it replaces oil or LPG heating for installations from 21 July 2026 to 31 March 2027. The MCS-certified installer named in your quote applies and deducts the grant.
Heat pump repairs prices in Gwent
Guide prices for Gwent, including VAT. We agree the visit rate before anyone attends, so there are no surprises on the day.
| 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 Gwent
We cover 11 towns in Gwent for heat pump repairs. Each links to local guide prices and the grant position for Wales.
| Town | Postcode district | Nearest town | Midwinter daylight |
|---|---|---|---|
| Newport (Gwent) | NP20 | Risca | 7 h 49 min |
| Cwmbran | NP44 | Pontypool | 7 h 48 min |
| Pontypool | NP4 | Cwmbran | 7 h 47 min |
| Ebbw Vale | NP23 | Tredegar | 7 h 47 min |
| Risca | NP11 | Newport (Gwent) | 7 h 48 min |
| Blackwood | NP12 | Bargoed | 7 h 48 min |
| Abergavenny | NP7 | Crickhowell | 7 h 46 min |
| Caldicot | NP26 | Chepstow | 7 h 49 min |
| Chepstow | NP16 | Caldicot | 7 h 48 min |
| Monmouth | NP25 | Chepstow | 7 h 46 min |
| Tredegar | NP22 | Ebbw Vale | 7 h 47 min |
Heat pump repairs questions
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.
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.
Why does my heat pump keep switching on and off?
Frequent starting and stopping, called short cycling, is usually caused by an oversized heat pump, low water flow, too many zones closing at once or controls set with too narrow a range. It reduces efficiency and wears components. An engineer can check the settings, flow rates and design, and can often improve it with control changes before any parts are needed.
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.