BoilerFaultCodesWorcester Bosch EA Fault Code
The Worcester Bosch EA fault code means: your boiler has failed to light because it cannot detect a flame, which most likely means there is an issue with the gas supply or a part that ignites the fuel.. It appears on 35 Worcester Bosch models in our database.
Technical description: Flame not detected.
What causes the Worcester Bosch EA fault?
This fault occurs when the boiler attempts to start up but fails to detect a steady flame after several attempts. The most common reasons include a lack of gas reaching the burner, a build-up of carbon on the ignition parts, or a blockage in the pipe that carries away waste moisture. In some cases, the sensors inside the boiler may simply be worn out and unable to tell the computer that the flame is lit.
This fault is more common in winter, as a frozen external condensate pipe can cause water to back up into the boiler and prevent the flame from lighting.
DIY fix possible
Check that your pre-payment gas meter has credit and is turned on.Verify that other gas appliances in your home, like a hob, are working correctly.Gently press and hold the 'Reset' button for five seconds to see if the boiler restarts.In freezing weather, check if your external plastic condensate pipe has frozen and thaw it with warm water.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like EA: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Worcester Bosch models that show the EA fault code
Click a model for the full fault code list and model-specific repair notes.
- 35 RSF Repair: £120-350
- 537i Repair: £150-350
- CDi Classic Repair: £120-£280
- CDi Classic Regular Repair: £120-250
- CDi Highflow Repair: £150-350
- CDi RSF Repair: £120-300
- Greenstar 12i System Repair: £100-350
- Greenstar 2000 Repair: £120-250
- Greenstar 25 HE Combi Repair: £90-280
- Greenstar 25HE Repair: £100-£350
- Greenstar 27CDi Repair: £120-250
- Greenstar 28CDi Repair: £120-250
- Greenstar 30CDi Classic System ErP Repair: £80-250
- Greenstar 30HE Repair: £100-£350
- Greenstar 30i Repair: £100-£250
- Greenstar 30si Repair: £120-250
- Greenstar 35 CDi Repair: £100-350
- Greenstar CDi Compact Repair: £100-£350
- Greenstar i Repair: £100-£350
- Greenstar i Junior Repair: £120-250
- Greenstar R29 40 HE Repair: £150-350
- Greenstar Ri Repair: £100-350
- Greenstar Si Combi / i System Repair: £80-250
- Greenstar System Repair: £150-350
- Greenstar ZWB7 Repair: £120-250
- Heatslave Repair: £100-£350
- Hideaway 90 Repair: £100-280
- Highflow 440 CDi Repair: £150-350
- Highflow 550 CDi Repair: £150-350
- R30 HE Plus Repair: £120-250
- Ri 25 HE Repair: £150-300
- Worcester 25/30 HE Repair: £120-£350
- WR325 RSF Repair: £150-300
- ZB 7 27 HE Repair: £150-350
- ZWB 7-25 Repair: £120-250
Source
Worcester Bosch EA 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 35 RSF manual (PDF)
- Worcester Bosch 537i manual (PDF)
- Worcester Bosch CDi Classic manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026