I am GSR just waiting for my approval for the combustion chamber forum before I can make any posts.
Companys AA Heating & Plumbing UK based in walsall, west midlands
But I need some serious advice folks, literally pulling my hair out on this one.
Been GSR for just under a year and been doing pretty well with the fault finding on boilers, well that's what I thought, until I come across this one.
Followed the MI still getting L2.
Ideals are common for the condensing getting blocked I'm aware.
This is what i've done with no joy following the MI.
1)Cannot get u-gauge onto gas inlet from the gas tap on the bottom of boiler, they've decided to build a cupboard round the boiler, but the boiler has been working fine for over 3 years so i thought no chance pipework is the problem, did a working at the meter 20.5 mbar with cooker running, with boiler going through it's ignition sequence you see the u-gauge move up and down, so I thought gas valve is okay.
2) Checked ignition electrode, continuity fine and sparking okay.
3) Checked the flame ionisation, continuity fine down to the pcb.
4) Flushed the heat exchanger by pouring water down it, abit of grit in there nothing major and cleaned the condensing trap.
5) Gas valve okay 220vdc on plug, 4.1kohms on valve using multimeter, (according to MI fine).
6) Replaced gas valve still same problem.
7) I put LDF on the top of the gas valve and when the pcb sends power to gas valve, the bubble seems to pop slowly not rapidly, I would of thought this ignition attempt the gas valve would open fully and let abit of gas onto the burner and the ldf bubble would pop rapidly, but never checked a gas valve this way before.
8) Removing the condensing trap, water is dripping from the heat exchanger outlet that connects to trap slowly, where's this water coming from when boiler is not on, the customer has advised me he had to re-pressurise the system twice a day, is there a hairline crack in the heat exchanger? couldn't see anything when I was pouring water down it and also would this really stop the boiler from not igniting?
Any help would be appreciated.
Companys AA Heating & Plumbing UK based in walsall, west midlands
But I need some serious advice folks, literally pulling my hair out on this one.
Been GSR for just under a year and been doing pretty well with the fault finding on boilers, well that's what I thought, until I come across this one.
Followed the MI still getting L2.
Ideals are common for the condensing getting blocked I'm aware.
This is what i've done with no joy following the MI.
1)Cannot get u-gauge onto gas inlet from the gas tap on the bottom of boiler, they've decided to build a cupboard round the boiler, but the boiler has been working fine for over 3 years so i thought no chance pipework is the problem, did a working at the meter 20.5 mbar with cooker running, with boiler going through it's ignition sequence you see the u-gauge move up and down, so I thought gas valve is okay.
2) Checked ignition electrode, continuity fine and sparking okay.
3) Checked the flame ionisation, continuity fine down to the pcb.
4) Flushed the heat exchanger by pouring water down it, abit of grit in there nothing major and cleaned the condensing trap.
5) Gas valve okay 220vdc on plug, 4.1kohms on valve using multimeter, (according to MI fine).
6) Replaced gas valve still same problem.
7) I put LDF on the top of the gas valve and when the pcb sends power to gas valve, the bubble seems to pop slowly not rapidly, I would of thought this ignition attempt the gas valve would open fully and let abit of gas onto the burner and the ldf bubble would pop rapidly, but never checked a gas valve this way before.
8) Removing the condensing trap, water is dripping from the heat exchanger outlet that connects to trap slowly, where's this water coming from when boiler is not on, the customer has advised me he had to re-pressurise the system twice a day, is there a hairline crack in the heat exchanger? couldn't see anything when I was pouring water down it and also would this really stop the boiler from not igniting?
Any help would be appreciated.