F32
FAULT CODE
Heatline
Incorrect Air Pressure / Flue Fault
High Severity
Engineer Required
The air pressure switch is not confirming correct airflow. May indicate a blocked flue, fan fault, or wiring issue.
Cold Weather Note
In cold weather, check for ice at the flue terminal.
Step-by-Step Fix Guide
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Step 1
Check the flue terminal externally for blockage
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Step 2
Turn off the boiler
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Step 3 Engineer only
Call a Gas Safe engineer to test the fan, air pressure switch, and flue system
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.