F47
FAULT CODE
Glow-worm
Mixed Gas Pressure Fault
High Severity
Engineer Required
Both low gas pressure and flame supervision faults are occurring.
Step-by-Step Fix Guide
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Step 1
This may indicate a serious gas supply issue
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Step 2
Check the gas meter and supply
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Step 3 Engineer only
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.