E44
FAULT CODE
Keston
Return Sensor Open Circuit (C55)
Medium Severity
Engineer Required
The return temperature sensor circuit is open on the C55 boiler.
Step-by-Step Fix Guide
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Step 1
Check the return sensor cable
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Step 2 Engineer only
Call a Gas Safe engineer
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.