Boiler problems
What's your boiler doing?
Pick the symptom below. We tell you what it usually means, the checks you can safely do yourself for nothing, what a real repair costs — and when we'd honestly tell you not to spend the money.
Pick your symptom
Common boiler problems
Boiler losing pressure
A sealed heating system should hold roughly 1 to 1.5 bar cold. If yours keeps sliding towards zero, water is escaping somewhere — pressure does not simply evaporate.
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Boiler leaking water
A leaking boiler is never something to leave. Water and electrics in the same casing means the PCB is on borrowed time, and a slow leak will rot the heat exchanger from the outside in.
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No hot water
When the heating works but the taps run cold, the boiler is firing — it just is not sending the heat to the right place. That narrows the fault down to a handful of components.
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Boiler keeps turning off
A boiler that lights and then shuts down within a minute or two is protecting itself. Something in the safety chain — flow, flame, pressure or airflow — is not happy.
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Radiators cold at the bottom
Cold at the top and hot at the bottom means trapped air — bleed it. Cold at the bottom and hot at the top means magnetite sludge sitting in the radiator, and bleeding will do nothing at all.
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Boiler making a banging noise
Boilers make noise, but they should not make new noise. A change in sound is nearly always the first warning that something is scaling, sticking or starving of flow.
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Boiler not firing up
Before anyone charges you, half of the no-heating calls we take can be narrowed down over the phone. Batteries, schedules, pressure and frozen condensate account for a huge share of winter callouts.
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Pilot light keeps going out
Modern condensing boilers do not have a standing pilot light. If yours does, you are looking at a boiler that is likely 20 years old or more and running at roughly 60-70% efficiency against 92%+ today.
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More boiler help
Fault codes explained
Worcester and Viessmann codes decoded.
How old is my boiler?
Find its age and what it's costing you.
Repair or replace?
Four questions, one straight answer.
Brands we repair
Vaillant, Ideal, Baxi, Glow-worm and more.
Emergency repairs
Same-day cover across the West Midlands.
Powerflushing
Cold radiators and sludge, sorted properly.