E133
FAULT CODE
Main Heating
Ignition Failure / Frozen Condensate
Medium Severity
DIY Check Possible
The boiler has failed to ignite. Identical to Baxi E133 — Main Heating shares the BDR Thermea fault code system. In winter, commonly caused by a frozen condensate pipe.
Cold Weather Note
E133 in winter on Main Heating boilers almost always means a frozen condensate pipe. Thaw before resetting.
Step-by-Step Fix Guide
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Step 1
Check gas supply is on
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Step 2
In cold weather, locate and thaw the condensate pipe with warm water
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Step 3
Reset the boiler
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Step 4
If fault persists, call a Gas Safe engineer
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.