5
FAULT CODE
Halstead
Return Thermistor Fault
Medium Severity
Engineer Required
The return water temperature sensor is reading outside its normal range.
Step-by-Step Fix Guide
-
Step 1 Engineer only
A Gas Safe engineer should test and replace the return thermistor
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.