I’ve searched the forum and I’m not getting the same problem that others have so finding it tricky to fault find.
Thermostat is showing green and red light.
Have checked the gas regulator is working.
Getting plenty of voltage at the thermostat.
Ignition on the heater is continuously clicking so that works too.
Have hoovered out the in and out pipes.
It tries to light but then nothing, just switches off.
No fault codes from the lights either
Anyone got any further ideas??
It has previously worked!