BoilerFaultCodesWorcester Bosch D1 241 Fault Code
Also written as D1241 — same fault.
The Worcester Bosch D1 241 fault code means: your boiler has lost the signal from the sensor that monitors the temperature of the water returning from your radiators, so it has stopped working to prevent damage.. It appears on 11 Worcester Bosch models in our database.
Technical description: Return sensor error - Sensor disconnected or damaged (the boiler will block for 300 seconds before this condition).
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 D1 241 fault code
Click a model for the full fault code list and model-specific repair notes.
- 24 RSF Repair: £90-180
- 26 CDi Xtra Repair: £90-160
- 30i Junior Repair: £90-160
- 35 RSF Repair: £90-160
- Danesmoor Repair: £90-180
- Greenstar 12i System Repair: £150-250
- Greenstar CDi Compact Repair: £120-220
- Heatslave Repair: £100-£190
- Hideaway Repair: £90-180
- Junior 24i Repair: £90-160
- Junior 28i Repair: £90-160
Source
Worcester Bosch D1 241 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