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It's a common fault then?

I believe it is a fault on both heating and water just I hadn't run it long enough on heating, I have now found that the fault occurs at the end of the post purge sequence after the water temperature has been reached, spoken to Firebird today and they have advised either pe cell or burner...

Does extraneous light during post purge mean that the burner is still lit or is it a fault with the pe cell?

Yep thanks, worked that one out, not leaving heating to run long enough to prove, have ordered correct or cell as original one ordered wasn't correct, will test further once replaced .

O wondered if the high limit for the water on the PCB would cause fault but can't identify it, ran it on heating for over 30 minutes without fault but as soon as it runs on water it fires without fault and shuts down offer 4 minutes the fan runs for about 30 seconds and 2-3 minutes later it...

Thought it might be pressure switch but bypassed and had same result, runs for 4-5 mins on water then shuts down, lockout light appears a few minutes later, reset button flashes red continually, ran on heating without fault, running out of ideas, ordered flow switch just in case but not certain...

Hi it's a riello burner works fine on Ch but locks out on water after 4 minutes, just checked continuity on pressure switch which seems to be dropping out

Hi all I need some advice, we have a Firebird external combi which lockout after running on water only for 4 minutes, runs fine on heating, thought it might be the water thermistor but having swapped over with the heating thermistor fault is still present, pump runs ok burner fires without fault...