F72
FAULT CODE
Heatline
Flow/Return Sensor Temperature Drift
Medium Severity
Engineer Required
A permanent temperature difference has been detected between the flow and return sensors, indicating a sensor fault.
Step-by-Step Fix Guide
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Step 1 Engineer only
Call a Gas Safe engineer to test both temperature sensors and replace any faulty ones
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.