BoilerFaultCodesWorcester Bosch Fd Fault Code
Also written as FD — same fault.
The Worcester Bosch Fd fault code means: your boiler is simply confused because the reset button was held down for too long or pressed when it wasn't needed.. It appears on 37 Worcester Bosch models in our database.
Technical description: Reset button pressed by mistake.
What causes the Worcester Bosch Fd fault?
This fault occurs when the boiler's internal computer receives a signal from the reset button for longer than expected, usually because the button was held down for more than 30 seconds. It can also happen if the button is pressed too many times in a short period or if it gets physically stuck in the control panel. Essentially, the boiler enters a confused state as a safety precaution because it cannot tell if you are trying to reset it or if there is a mechanical hardware failure.
DIY fix possible
Press the reset button again firmly once and release it immediately.Turn the power to the boiler off at the fused spur switch, wait 30 seconds, and turn it back on.If the code persists, wait 30 seconds for the display to clear itself naturally.
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Worcester Bosch models that show the Fd fault code
Click a model for the full fault code list and model-specific repair notes.
- 533 Compact
- 535 Compact
- 537i
- CDi Classic
- CDi Classic Regular
- CDi Highflow
- Greenstar 24
- Greenstar 25 Si Compact Repair: £0-80
- Greenstar 25HE
- Greenstar 25Si Compact ErP Repair: £0-80
- Greenstar 27i System Compact ErP Repair: £0-80
- Greenstar 28
- Greenstar 28CDi Compact ErP Repair: £0-80
- Greenstar 30 CDi Conventional
- Greenstar 30 CDi System
- Greenstar 30 Si Compact Repair: £0-80
- Greenstar 30CDi Classic System ErP
- Greenstar 30HE
- Greenstar 30i System Compact ErP Repair: £0-80
- Greenstar 30Si Compact ErP Repair: £0-80
- Greenstar 40 CDi Conventional
- Greenstar 42CDi
- Greenstar CDi Classic (2012)
- Greenstar CDi Compact
- Greenstar Highflow
- Greenstar i
- Greenstar R 28 HE System
- Greenstar R29 40 HE
- Greenstar System
- Greenstar ZWB7
- Highflow 400 Electronic BF
- Highflow 440 CDi
- Highflow 550 CDi
- R30 HE Plus
- Worcester 25/30 HE
- ZB 7 27 HE
- ZWB 7-25
Source
Worcester Bosch Fd fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
- Worcester Bosch 535 Compact manual (PDF)
- Worcester Bosch 537i manual (PDF)
- Worcester Bosch Greenstar 28 manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026