Boiler Not Firing Up
The boiler shows an error code, flashes a warning light, or simply will not ignite when heating or hot water is called for.
What Is Causing This?
- 1Frozen condensate pipe in cold weather
- 2Faulty ignition electrode or lead
- 3Gas valve, pump, or PCB failure
How Urgent Is This?
This needs prompt attention. Delaying could cause further damage, safety risks, or significantly higher repair costs.
What Needs to Be Done
A Gas Safe engineer will diagnose the error code, check the condensate pipe, ignition, gas supply, and electrical components, and replace whichever part has failed.
How Much Will It Cost?
National average estimate
Labour: £85 – £200 | Materials: £30 – £178
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Prices are estimates based on typical UK rates. Actual costs depend on the specific issue, accessibility, and your location. All quotes from tradespeople on Tradesfolk are completely free.
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Ask a QuestionHow to Prevent This
Lag the condensate pipe to prevent freezing. Have the boiler serviced annually. Keep the boiler running on a low setting during very cold weather.
Related Problems
Hot water taps run cold or lukewarm despite the boiler or immersion heater being switched on.
Both the central heating and hot water have stopped working completely, often during cold weather.
The boiler pressure gauge keeps falling below 1 bar, causing the boiler to lock out or lose heating efficiency.
Other Gas Engineer Problems
Loud banging, kettling, or rumbling sounds coming from the boiler, particularly when the heating or hot water comes on.
The boiler pilot light repeatedly extinguishes, meaning the boiler will not fire up for heating or hot water.
A smell of gas (rotten eggs) inside the house, which could indicate a gas leak.
The boiler pressure gauge keeps falling below 1 bar, causing the boiler to lock out or lose heating efficiency.