Condensate Drain Blocked
The condensate drain pipe is blocked or frozen.
Frozen condensate pipes are very common in winter. Insulate the pipe to prevent future freezing.
Step-by-Step Fix Guide
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Step 1
Check the condensate pipe for ice or blockages
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Step 2
Pour warm water over frozen sections
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Step 3
Reset the boiler after clearing
Work on gas appliances must be carried out by a Gas Safe registered engineer. The steps above cover safe checks a homeowner can perform - any internal component replacement requires a qualified professional. If in doubt, always call an engineer.