C1
FAULT CODE
Ideal
Flue Temperature Too High
High Severity
Engineer Required
The flue gas temperature has exceeded the safe limit. The boiler has shut down to prevent damage to the flue system.
Step-by-Step Fix Guide
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Step 1
Check for blockages at the external flue terminal
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Step 2
A Gas Safe engineer should check the heat exchanger for scaling or blockage
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Step 3 Engineer only
The flue may also need inspection for correct installation
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.