Choose your Worcester Bosch appliance
About Worcester Bosch
Worcester Bosch is a boiler maker based in Worcester, England, and part of the Bosch group. Its Greenstar and older CDi boilers are among the most common in UK homes. Older CDi models show a two-character code, while Greenstar boilers add a three-digit cause number, so note everything the display shows.
Worcester Bosch boiler error codes
- EA / EA 227Burner didn't light (no flame detected)
- CE 207 / H07Heating system water pressure too low
- E9 / E9 224Overheat limiter tripped
- FdReset button pressed or power cut during a fault
- A1Pump has run dry
- C6Fan running too slowly
- E2Heating flow temperature sensor fault
- A7Hot water temperature sensor fault
All 15 Worcester Bosch boiler codes
Before you start
- Find your model number. It's on the rating label, usually inside the door or lid, on the frame, or on the back or side panel.
- Try a reset. Unplug the appliance or switch off its breaker for 10 minutes. Many codes are one-off glitches.
- Stay safe. Never bypass safety switches or work on live wiring, gas or refrigerant lines. Each guide tells you when to call a technician.