1074 W
FAULT CODE
Worcester Bosch
Flow Temperature Sensor No Signal (8000 Series)
Medium Severity
Engineer Required
On 8000 Series boilers, code 1074 W means the flow temperature sensor is not providing a signal — it may be disconnected.
Step-by-Step Fix Guide
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Step 1
Check the sensor plug connection
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Step 2 Engineer only
Call a Gas Safe engineer to inspect the sensor and wiring
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.