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 Oxfordshire can arrange a fault-finding visit at a rate agreed before an engineer attends. We repair heat pumps in Oxfordshire whoever installed them, including older monobloc and split systems. Across Oxfordshire and Oxfordshire, refrigerant repairs on split systems are carried out by an F-gas certified engineer.
Who it suits
- Heat pumps installed by another company that need a second opinion
- Systems losing pressure or needing frequent topping up
- Rooms or hot water not getting warm enough
- Heat pumps showing an error code or fault light
Grants and rules for heat pumps in England
In England 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), and since 28 April 2026 a valid EPC is no longer needed. The grant is applied for by the MCS-certified installer and shown as a deduction on your quote.
Heat pump repairs prices in Oxfordshire
These are guide prices including VAT. The rate for your visit in Oxfordshire 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–£190 |
| Sensor or thermistor replacement | £120–£290 |
| Expansion vessel or pressure relief valve | £160–£360 |
| Circulating pump replacement | £260–£500 |
| Fan motor replacement | £310–£680 |
| Refrigerant leak repair and re-gas (split systems) | £360–£990 |
| Main control board (PCB) replacement | £470–£1,150 |
Inc VAT. The fault-finding rate is agreed before we attend; repairs are priced in writing before parts are ordered.
Towns we cover in Oxfordshire
We cover 11 towns in Oxfordshire for heat pump repairs. Each links to local guide prices and the grant position for England.
| Town | Postcode district | Nearest town | Midwinter daylight |
|---|---|---|---|
| Oxford | OX1 | Abingdon | 7 h 47 min |
| Banbury | OX16 | Brackley | 7 h 44 min |
| Abingdon | OX14 | Didcot | 7 h 48 min |
| Bicester | OX26 | Oxford | 7 h 45 min |
| Didcot | OX11 | Abingdon | 7 h 48 min |
| Witney | OX28 | Oxford | 7 h 47 min |
| Chipping Norton | OX7 | Stow-on-the-Wold | 7 h 45 min |
| Henley-on-Thames | RG9 | Marlow | 7 h 49 min |
| Thame | OX9 | Princes Risborough | 7 h 47 min |
| Wallingford | OX10 | Didcot | 7 h 49 min |
| Wantage | OX12 | Didcot | 7 h 49 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.
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.
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.
Do refrigerant repairs need a specialist?
Yes. Any work on a heat pump's refrigerant circuit, such as tracing a leak, replacing a component or re-gassing, must by law be done by an F-gas certified engineer where the refrigerant is fluorinated, such as R32; units using R290 (propane) need an engineer trained in flammable refrigerants. On split systems the refrigerant runs through pipes inside your home, so leaks there are more likely than on sealed monobloc units.