FA
FAULT CODE
Ideal
Flow/Return Sensors Reversed (Regular Boilers)
Medium Severity
Engineer Required
On Ideal Logic Max and Logic Plus regular (heat-only) boilers, code FA indicates the flow and return temperature sensors appear to be reversed or giving inverted readings.
Step-by-Step Fix Guide
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Step 1
This usually occurs after installation or service work
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Step 2 Engineer only
The engineer who last worked on the boiler should check the flow and return sensor positions and ensure they are correctly clipped to the correct pipes
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.