E20
FAULT CODE
Baxi
Flame Failure — Lockout
Medium Severity
DIY Check Possible
The boiler failed to detect a flame after the ignition sequence, or the flame extinguished during operation.
Cold Weather Note
E20 in cold weather is commonly caused by a frozen condensate pipe. Thaw before resetting.
Step-by-Step Fix Guide
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Step 1
Check gas supply — try other gas appliances
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Step 2
Check for frozen condensate pipe in cold weather and thaw with warm water
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Step 3
Reset the boiler once using the selector switch (turn to R, hold 5 seconds)
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Step 4
If E20 returns, 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.