What's the most common cause of frozen condensate pipe?

External condensate pipe exposed to sub-zero temperatures. Other common causes include: Pipe run too long or with insufficient fall (water sits and freezes).

Can I fix frozen condensate pipe myself?

Some causes — like topping up boiler pressure or bleeding a radiator — are safe DIY. Anything involving the gas supply, the boiler casing or persistent fault codes needs a Gas Safe registered engineer. We're 980201 — verifiable on the Gas Safe Register.

How much does it cost to fix frozen condensate pipe?

We give a fixed price up front before any work begins — no call-out scams, no surprise fees. Most frozen condensate pipe call-outs are diagnosed and fixed in a single visit thanks to common parts carried on the van.

Are you Gas Safe registered?

Yes — every job is carried out by a Gas Safe registered engineer (registration 980201). You can verify on the Gas Safe Register at any time.

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Frozen Condensate Pipe

Gas Safe Reg. 980201• Same-day across Bradford, Leeds & Yorkshire

In freezing weather, the condensate pipe — the white plastic pipe that carries waste water from your boiler to the drain — can freeze solid. This blocks the boiler, triggers a fault code (often F1, F28, F29 or EA), and leaves you without heating on the coldest day of the year. It's one of the most common winter call-outs we attend across Bradford and Leeds.

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Most likely causes

1External condensate pipe exposed to sub-zero temperatures
2Pipe run too long or with insufficient fall (water sits and freezes)
3Pipe termination in a cold area (north-facing wall, shaded corner)
4No insulation on outdoor section of pipe
5Blocked or partially restricted drain causing back-up and freeze

What you can safely check first

Locate the white plastic pipe outside

Find the 21mm or 32mm white plastic pipe leaving the boiler and running to a drain or soakaway. It's usually on a wall near the boiler.

Thaw it with warm water

Pour warm (NOT boiling) water along the pipe, or use a warm hot-water bottle. Boiling water can crack the plastic. Start from the boiler end and work towards the drain.

Reset the boiler

Once thawed, reset the boiler using the reset button. If it fires and runs normally, the pipe was frozen. If the fault returns within minutes, call us — there may be a deeper blockage.

Call straight away if…

You can't safely reach the external pipe (high up, icy ground, unsafe ladder)
Boiler re-locks out immediately after thawing and reset
The pipe has frozen repeatedly this winter — it needs insulating or re-routing

Call now — 07873 345716

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