F004
FAULT CODE
Intergas
No Flame During Startup (Xtreme/Xclusive)
Medium Severity
DIY Check Possible
On Intergas Xtreme/Xclusive, F004 indicates no flame was detected during the ignition sequence. Gas valve may be closed or condensate drain blocked.
Cold Weather Note
F004 in cold weather is commonly caused by a frozen condensate drain on Intergas boilers.
Step-by-Step Fix Guide
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Step 1
Check the gas isolation valve is fully open
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Step 2
In cold weather, check for a blocked or frozen condensate drain
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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.