BoilerFaultCodesWorcester Bosch E9 285 Fault Code
Also written as E9285 — same fault.
The Worcester Bosch E9 285 fault code means: your boiler has shut down because it has detected that the water temperature is becoming dangerously hot, which usually means the water isn't moving through the system properly.. It appears on 11 Worcester Bosch models in our database.
Technical description: The boiler return temperature sensor has measured a temperature higher than 95°c
DIY fix possible
Check that your radiator valves are open and not turned to the off position.Ensure the boiler pressure gauge is between 1 and 1.5 bar.Gently bleed your radiators to remove any trapped air that might be blocking water flow.
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Search the official register for a qualified engineer in your area.
Gas Safe Register →Worcester Bosch models that show the E9 285 fault code
Click a model for the full fault code list and model-specific repair notes.
- 24 RSF Repair: £120-350
- 26 CDi Xtra Repair: £90-220
- 30i Junior Repair: £120-280
- 35 RSF Repair: £120-280
- Danesmoor Repair: £120-350
- Greenstar 12i System Repair: £150-350
- Greenstar CDi Compact Repair: £150-300
- Heatslave Repair: £120-350
- Hideaway Repair: £100-220
- Junior 24i Repair: £120-350
- Junior 28i Repair: £120-300
Source
Worcester Bosch E9 285 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