E133
FAULT CODE
Potterton
Ignition Failure / Frozen Condensate
Medium Severity
DIY Check Possible
The boiler has failed to ignite. In winter, the most common cause is a frozen condensate pipe.
Cold Weather Note
E133 in winter almost always means a frozen condensate pipe.
Step-by-Step Fix Guide
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Step 1
Confirm other gas appliances work
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Step 2
Check for a frozen condensate pipe in cold weather and thaw with warm water
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Step 3
Reset the boiler once
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Step 4
If the code returns, call a Gas Safe engineer to check ignition components
Gas Safe Reminder
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.