KB Heating & Plumbing repairs gas boilers of all makes across Cardiff, Penarth, Caerphilly and the Vale of Glamorgan, with same-day callouts and a 24/7 emergency service. KB Heating & Plumbing is Gas Safe registered (registration number 516445), based at 13 Wyfan Place, Cardiff CF14 3DT, with 20 years of trade experience. Call 07812 510121 and describe what the boiler is doing, and you will get an honest idea of the likely fault before the engineer arrives.
Signs your boiler needs repair
- No heating, no hot water, or both.
- A fault code or flashing light on the boiler display.
- The boiler locking out and needing to be reset again and again.
- Pressure that keeps dropping below 1 bar.
- Banging, gurgling or kettling noises.
- Water dripping from the boiler or the pipes underneath it.
- Radiators that stay cold at the bottom or never get properly hot.
- In freezing weather, a condensing boiler that stops with a gurgling sound, which often means a frozen condensate pipe.
If you smell gas, do not touch the boiler. Turn off the gas at the meter if it is safe to do so, leave the property and call the National Gas Emergency number on 0800 111 999.
Common boiler faults in Cardiff homes
Most boiler breakdowns KB Heating & Plumbing sees in Cardiff come down to a small number of causes:
- Hard water scale. South Wales water leaves limescale inside the heat exchanger, which causes kettling, poor hot water and overheating lockouts.
- Loss of pressure, from a leak, a faulty pressure relief valve or a flat expansion vessel.
- Failed parts such as the diverter valve, pump, fan, gas valve or printed circuit board.
- Frozen condensate pipes on condensing boilers during cold snaps, especially where the pipe runs outside.
- Sludge in older central heating systems, which blocks the heat exchanger and leaves radiators cold.
How KB Heating & Plumbing repairs a boiler
The engineer reads the fault code, checks the system pressure, flow, gas pressure and flue, and finds the root cause rather than just resetting the boiler. You get an explanation of the fault and a fixed price before any repair starts.
Common parts are carried in the van, so most repairs are finished on the first visit, usually within one to two hours. If a part has to be ordered, you get a clear timescale and a return visit is booked. Every repair ends with the boiler tested and the system checked for safe operation.
If a boiler is old, unsafe or would cost more to fix than it is worth, the engineer will say so, and can quote for a boiler replacement as an option, never as pressure.
Boiler repair cost in Cardiff
The cost depends on the fault and the part needed. KB Heating & Plumbing gives you a clear price before any repair work starts, so there are no surprises on the invoice.
Boiler repair FAQs
Which boiler makes do you repair?
KB Heating & Plumbing repairs all common makes of gas boiler fitted in Cardiff homes, including combi, system and conventional (heat-only) boilers.
Can you come out the same day?
Same-day repairs are available in most cases, and KB Heating & Plumbing runs a 24/7 service for breakdowns at night and at weekends. See emergency boiler repair.
What can I check before I call?
Check that the gas and electricity are on, the thermostat is calling for heat, and the pressure gauge reads between 1 and 1.5 bar. In freezing weather, pouring warm (not boiling) water over an outside condensate pipe can clear an ice blockage. If none of that works, call 07812 510121.
How can I stop my boiler breaking down?
An annual boiler service catches worn parts and scale build-up before they cause a winter breakdown.