2927 B
FAULT CODE
Worcester Bosch
Flame Lost During Operation (8000 Series)
Medium Severity
DIY Check Possible
On 8000 Series boilers, code 2927 B means the ionisation current was insufficient during the burning phase — the flame has been lost. 'B' indicates a blocking (non-lockout) fault.
Cold Weather Note
2927 B in winter 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
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Step 2
In cold weather, check for a frozen condensate pipe and thaw with warm water
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Step 3
Reset the boiler once
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Step 4
If 2927 persists, a Gas Safe engineer should check the ionisation electrode, gas valve, and flue system
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.