EA
No ionisation detected after ignition
The boiler has attempted ignition but has not detected the expected flame ionisation signal.
What this code means
The boiler has attempted ignition but has not detected the expected flame ionisation signal.
Possible causes
- Gas supply or ignition problem
- Ignition electrode issue
- Flame-sensing problem
- Gas valve or control fault
Common symptoms
- EA displayed
- Boiler may lock out
- No heating or hot water
Checks to make
- Check whether other gas appliances have supply if safe to do so
- Do not repeatedly reset the boiler
- Arrange qualified diagnosis if the fault remains
Safety
- Gas and combustion faults require appropriately qualified personnel. Do not remove the boiler casing or work on gas components.
Model notes
Worcester literature also uses EA for certain loss-of-ionisation conditions.