Thermocompact 242 eh - sparks, ignites x 10ish times then locks out

[Pooly89]

Hi Guys,

I have a bit of a problem with a thermocompact 242eh in that it sparks and ignites several times an then locks out. I have a feeling that the solenoid or gas valve is at fault. a video of the fault can be found below.

[video=youtube;1mMlu0zhVeM]https://www.youtube.com/watch?v=1mMlu0zhVeM[/video]

Any help would be greatly appreciated

Cheers

Pooly

 

[Last Plumber]

Flame detection.
Need to check, Min gas pressure, ionisation current etc.
Also polarity

 

[Last Plumber]

https://www.google.co.uk/url?sa=t&r...ZOsfsaSwbiAKK1lfw&sig2=idv_IzrvmLzbDMNPltM8fw

 

[Pooly89]

Can't check gas pressure cus it won't stay on long enough to be stable.

 

[Last Plumber]

Check voltage to solenoid and look through that manual I posted link on. There's fault finding at back. Before you waste any time, ring merchants and check PCB's are still available. There's a few on those and the rest is basically mechanical

 

[ShaunCorbs]

I would say flame dec/ ini

 

[Last Plumber]

I would say flame dec/ ini

I like your abbreviations shaun they keep my mind working.
That one will be every part on boiler going through my head tonight dec/ini ?

 

[ShaunCorbs]

I like your abbreviations shaun they keep my mind working.
That one will be every part on boiler going through my head tonight dec/ini ?

cant spell and was on phone let me google it

Flame detection / ionising probes

 

[Last Plumber]

cant spell and was on phone let me google it

Flame detection / ionising probes

Ah got it

No, cant agree with that shaun, All happens too fast, have you watched video ?

I think it's a relay or a switch making and breaking. You can hear the clunk, Its all mechanical on those, it'll be something not engaging properly. Old now them though !
time for bye bye's

 

[ShaunCorbs]

Ah got it

No, cant agree with that shaun, All happens too fast, have you watched video ?

I think it's a relay or a switch making and breaking. You can hear the clunk, Its all mechanical on those, it'll be something not engaging properly. Old now them though !
time for bye bye's

yes and no its opening and lighting and if it was a fault with the gas valve or solenoid it wouldn't work / stay shut or open, so that leads me to not sensing a flame or a pcb

tbh dont think you will get parts or will be expensive might be time for a new boiler if you defo cant

 

[Pooly89]

Ok, so I did a little more testing found out that there's continuity from the flame rectification probe to the PCB and opened up the pcb box carefully to show this electromagnetic microswitch on the board(see video below).

[video=youtube;chpsB10yHH8]https://www.youtube.com/watch?v=chpsB10yHH8&feature=youtu.be[/video]

with this in mind other than blaming the pcb is there anything else likely to be causing this other than board or magnetic switch(on pcb) failure?

Cheer

Pooly