- Area
- South Glamorgan
- Postcode district
- CF61
- Nation
- Wales
- Guide price
- From £90 inc VAT
- Visit
- Rate agreed in advance
Before you book: heat pump repairs in Llantwit Major
Whoever installed your heat pump, aftercare can be arranged in Llantwit Major. Tell us the make and model and roughly how old it is, and we will set out what the visit involves before you book.
Across Llantwit Major and South Glamorgan, refrigerant repairs on split systems are carried out by an F-gas certified engineer. Heat pump owners in Llantwit Major can arrange a fault-finding visit at a rate agreed before an engineer attends.
When a heat pump shows an error, loses pressure or stops heating, an engineer diagnoses the cause and explains the repair and its cost before fixing it.
- Outdoor units that have become noisy, iced up or keep switching on and off
- Heat pumps installed by another company that need a second opinion
- Systems losing pressure or needing frequent topping up
What's included
- Reading of error history and operating data
- Testing of sensors, pumps, valves, pressures and electrics
- Fault-finding visit at a rate agreed before attending
- A clear explanation of the fault and a price for the repair before work goes ahead
- Supply and fitting of replacement parts
Outdoor units in exposed spots around Llantwit Major can ice more heavily, so siting is checked as part of any icing fault.
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 Llantwit Major quote.
Heat pump repairs costs around Llantwit Major
Guide prices for South Glamorgan, 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.
Short winter days in Llantwit Major and what they mean
Llantwit Major sees roughly 7 hours 50 minutes of daylight in late December against 16 hours 37 minutes in June. Milder southern winters suit heat pumps well, though the system is still sized for a cold snap rather than an average day.
How a visit works in Llantwit Major
- Tell us the make if you know it, the error code or symptoms, and send photos of the unit and controller.
- We confirm the fault-finding rate and arrange a visit in Llantwit Major.
- The engineer diagnoses the fault and gives you a written price for the repair.
- Parts are ordered once you agree, and the repair is completed and tested.
Heat pump repairs in Llantwit Major: questions
Will the engineer need access indoors as well as outside?
Usually yes. The outdoor unit, the hot water cylinder, the controls and the pipework and valves indoors are all part of the visit, so allow access to each.
What should I check before booking a visit in Llantwit Major?
Note any error code on the controller, check the system pressure gauge if you have one, and make sure the outdoor unit is clear of leaves or snow. Photos of the unit and controller help.
Can you work on a heat pump in Llantwit Major that someone else installed?
Yes. We arrange servicing and repairs for most air source heat pumps in Llantwit Major, whoever fitted them. Tell us the make and model when you get in touch.
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.
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.