E40
FAULT CODE
Main Heating
CH Return Sensor Error
Medium Severity
Engineer Required
Central heating return sensor has a fault on Main Eco Compact boilers.
Step-by-Step Fix Guide
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Step 1 Engineer only
Call a Gas Safe engineer to test the return sensor
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.