E154
FAULT CODE
Main Heating
Flow/Return Sensor Test Failure
Medium Severity
Engineer Required
The boiler's internal sensor cross-check test has failed.
Step-by-Step Fix Guide
-
Step 1 Engineer only
Call a Gas Safe engineer to test the flow and return sensors
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.