306
FAULT CODE
Ariston
Air Pressure Switch Fault
High Severity
Engineer Required
The air pressure switch is not closing when the fan runs. The boiler cannot verify adequate combustion airflow.
Step-by-Step Fix Guide
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Step 1
Check the external flue terminal for blockages
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Step 2 Engineer only
A Gas Safe engineer should check the condensate trap, air pressure switch, silicon tubing, and fan
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.