E31
FAULT CODE
Keston
Flow Sensor Open Circuit
Medium Severity
Engineer Required
The flow temperature sensor circuit is open — the sensor is not connected or has failed.
Step-by-Step Fix Guide
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Step 1
Check the flow sensor cable connections
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Step 2 Engineer only
Call a Gas Safe engineer if connections appear secure
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.