BoilerFaultCodesWorcester Bosch 1074 W Fault Code
Also written as 1074W — same fault.
The Worcester Bosch 1074 W fault code means: your boiler has lost communication with its internal thermometer, meaning it cannot safely monitor the temperature of the water circulating through your radiators.. It appears on 11 Worcester Bosch models in our database.
Technical description: No signal from the flow temperature sensor available – connect the plug to the flow temperature sensor correctly or temperature sensor could need replacing
What causes the Worcester Bosch 1074 W fault?
This fault occurs when the boiler's main control board loses the electronic 'handshake' with the sensor that monitors outgoing water temperature. The most common reason is a loose or corroded wiring connection, but it can also happen if the internal sensor has developed a physical defect and can no longer send a steady signal.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Worcester Bosch models that show the 1074 W fault code
Click a model for the full fault code list and model-specific repair notes.
- 24 RSF Repair: £100-180
- 26 CDi Xtra Repair: £90-180
- 30i Junior Repair: £90-160
- 35 RSF Repair: £90-180
- Danesmoor Repair: £100-180
- Greenstar 2000 Repair: £90-160
- Greenstar 8000 Life/Style Repair: £90-160
- Heatslave Repair: £90-180
- Hideaway Repair: £90-160
- Junior 24i Repair: £90-160
- Junior 28i Repair: £90-160
Source
Worcester Bosch 1074 W fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026