BoilerFaultCodesWorcester Bosch 1073 W Fault Code
Also written as 1073W — same fault.
The Worcester Bosch 1073 W fault code means: your boiler has detected an electrical fault with its main temperature sensor, which means it cannot safely monitor how hot the water is and has stopped working as a precaution.. It appears on 11 Worcester Bosch models in our database.
Technical description: Short circuit of the flow temperature sensor – the temperature sensor may need replacing
What causes the Worcester Bosch 1073 W fault?
This fault occurs when the boiler's control set loses the ability to correctly read signals from the flow temperature sensor. The most common reason is that the internal sensor has suffered a technical failure or the wiring connecting it to the main circuit board has become damaged or loose. Because the boiler no longer knows how hot the water is, it shuts down to prevent any risk of overheating.
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 1073 W fault code
Click a model for the full fault code list and model-specific repair notes.
- 24 RSF Repair: £120-190
- 26 CDi Xtra Repair: £90-160
- 30i Junior Repair: £100-£180
- 35 RSF Repair: £120-£190
- Danesmoor Repair: £90-160
- Greenstar 2000 Repair: £110-190
- Greenstar 8000 Life/Style Repair: £90-160
- Heatslave Repair: £90-160
- Hideaway Repair: £90-160
- Junior 24i Repair: £90-160
- Junior 28i Repair: £90-£160
Source
Worcester Bosch 1073 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