Verified boiler fault code
Worcester Bosch EA Fault Code (Greenstar FS CDi ErP Regular)
Flame not detected.
Safety disclaimer
Fault code summary
- Manufacturer
- Worcester Bosch
- Fault code
- EA
- Fault type
- Flame failure, Ignition, Gas supply
- Severity
- high
- Reset
- After a safe, accessible condensate blockage is thawed, the manual says to press the reset button for five seconds and wait two to three minutes. Do not repeatedly reset an unresolved fault.
- Applicable models
- Greenstar FS 30CDi ErP Regular, Greenstar FS 42CDi ErP Regular
Quick answer
Flame not detected.
What does this fault code mean?
Flame not detected.
Common causes
- No gas supply or low gas supply pressure.
- Frozen condensate pipe.
- Blocked flue outlet.
Symptoms
- The boiler may display EA and stop operating.
What can the homeowner safely check?
- If safe to do so, check that gas is on in the house.
- If safe to do so, check the condensate pipe outlet for freezing or blockage.
- If safe to do so, check the flue outlet for an obvious blockage.
Boiler reset information
After a safe, accessible condensate blockage is thawed, the manual says to press the reset button for five seconds and wait two to three minutes. Do not repeatedly reset an unresolved fault.
When should I call an engineer?
Contact a suitably qualified heating engineer when the fault persists, the boiler locks out, or the manufacturer instructions do not resolve it. For gas appliance work in the UK, use a Gas Safe registered engineer.
Engineer diagnosis
- Investigate gas supply, flame detection, condensate discharge and flue termination.
Applicable boiler models
Related fault codes
- A7 — Greenstar FS CDi ErP Regular
Hot water NTC sensor defective.
Read fault code - A8 — Greenstar FS CDi ErP Regular
Break in communication to the weather compensating clip-in control or Greenstar Comfort II RF.
Read fault code - b1 — Greenstar FS CDi ErP Regular
Code plug not detected.
Read fault code - C6 — Greenstar FS CDi ErP Regular
Fan speed too low.
Read fault code - d5 — Greenstar FS CDi ErP Regular
Condensate pump fault.
Read fault code - E2 — Greenstar FS CDi ErP Regular
CH flow NTC sensor defective.
Read fault code - E9 — Greenstar FS CDi ErP Regular
Safety temperature limiter in the CH flow has tripped.
Read fault code - F0 — Greenstar FS CDi ErP Regular
Internal error.
Read fault code
Manufacturer documentation
Greenstar FS 30CDi & 42CDi ErP Regular user instructionsEA | Flame not detected. Check, if it is safe to do so: if gas is on in the house; for frozen condensate pipe; for blocked flue outlet
Last verified
2026-09-12
Frequently asked questions
What does Worcester Bosch EA mean?
Flame not detected.
Can I reset a Worcester Bosch EA fault?
After a safe, accessible condensate blockage is thawed, the manual says to press the reset button for five seconds and wait two to three minutes. Do not repeatedly reset an unresolved fault.