Why is my central heating not working?
Central heating failures are commonly caused by low boiler pressure, a faulty thermostat, trapped air in radiators, or a broken pump or valve.
Common Reasons Central Heating Stops Working
- Low boiler pressure — check the pressure gauge; most boilers need 1–1.5 bar
- Thermostat issues — incorrect settings, dead batteries, or a wiring fault
- Trapped air — radiators cold at the top usually need bleeding
- Faulty pump or motorised valve — prevents hot water circulating to radiators
- Boiler lockout — many modern boilers display a fault code when they detect a problem
What to Check First
- Check the boiler pressure gauge and thermostat settings
- Bleed radiators that feel cold at the top
- Check for any error codes on the boiler display
If these don't resolve it, call RARE on 020 7458 4949 — our engineers diagnose and repair central heating faults across London same-day where possible.
Reviewed by RARE Plumbing London Engineering Team — Gas Safe registered engineers serving prime London since 2013.
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Central Heating Not Working
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