Boiler stopped working in freezing weather in Coventry? A frozen condensate pipe is the most common cause. How to spot it and thaw it safely, and when to call an engineer.
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If your boiler stops working on a freezing morning, the most likely cause is a frozen condensate pipe. Modern condensing boilers make a small amount of waste water, and a thin plastic pipe, usually white or grey, carries it outside to a drain. In a hard frost the water in that pipe can freeze, the boiler senses the blockage and shuts itself down. Often it shows a fault code or makes a gurgling noise as it tries to restart.
The good news is that this is one of the few boiler faults you can usually fix yourself, safely, in a few minutes. The pipe tends to freeze where it runs outside, especially at a bend, the end of the pipe or any part that sags. Across Coventry we see it most on homes where the pipe runs a long way along an outside wall before reaching the drain, common on the 1960s and 70s houses in Tile Hill, Canley and Wyken, and on newer estates where the pipe drops straight down an exposed wall.
Thaw it with warm water, never boiling, which can crack the plastic. Once the pipe is clear, reset the boiler and it should fire up again. If it freezes every cold snap, the pipe can be rerouted, lagged or swapped for a wider one so it does not keep happening.
Look outside, near where the boiler is, for a white or grey plastic pipe running down the wall to a drain. That is the condensate pipe.
Pour warm water from a kettle that has cooled for a while, or use a hot water bottle, along the pipe, especially at bends and the open end. Boiling water can crack it.
Once the ice has cleared, press the reset button on the boiler, as your manual shows. It should restart within a few minutes.
A gurgling sound from the boiler or the pipe in freezing weather is a classic sign of a frozen condensate pipe.
If it keeps happening, the pipe can be lagged, rerouted indoors or replaced with a wider one. Ask us when you ring.
If the boiler stopped during freezing weather, shows a fault code, and you can hear gurgling, it is very likely. A frozen outside pipe confirms it.
Yes, it is safe to pour warm water over the outside pipe or hold a hot water bottle on it. Never use boiling water, and never take any panels off the boiler. Smell gas, or think something is not right? Get everyone outside, leave the switches alone and ring the National Gas Emergency line on 0800 111 999.
Try the reset once more. If it still will not fire, the fault may be something else, and that is the time to ring us.
Lagging the outside section, a wider pipe or rerouting it so less of it is outside all help. It is a small job and worth doing before the next cold snap.
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