Glow-worm 56 2 Fault Codes

Regular Natural Gas 16.4 kW 1980-1994 Discontinued

GC Number: 41-311-66

Replaced by: Flexicom r

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Most common fault codes

Code	Severity	Plain English	DIY
A	High	Your boiler's pilot light safety sensor has failed, meaning the unit cannot stay lit to provide heating or hot water.	Engineer
B	Low	Your boiler's internal safety connection is working correctly, which typically means the system is performing a normal startup check or confirming the pilot light is healthy.	Yes
C	High	Your boiler has detected a mechanical issue with the gas control valve, meaning it cannot safely ignite to provide heating or hot water.	Engineer

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