E2
FAULT CODE
Worcester Bosch
Flow NTC Sensor Fault
Medium Severity
Engineer Required
The flow temperature sensor (NTC thermistor) is giving an incorrect reading — either out of range or the wiring is damaged.
Step-by-Step Fix Guide
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Step 1
Reset once
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Step 2 Engineer only
If fault persists, a Gas Safe engineer must test the NTC thermistor resistance and replace if faulty
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.