3
FAULT CODE
Alpha
High Flue Temperature
High Severity
Engineer Required
The flue gas temperature has reached a dangerous level. Usually caused by a blocked or restricted primary flow, blocked heat exchanger, flue restriction, or a flue sensor fault.
Step-by-Step Fix Guide
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Step 1
Do not attempt to inspect the flue yourself
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Step 2
Turn off the boiler
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Step 3 Engineer only
Call a Gas Safe engineer to check for flue blockages and heat exchanger condition
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.