Solo 3 PFL overheat

[farenuf]

Iv got a solo 50 PFL Which is doing nowt With elecs on just has constant overheat light on,wont reset,overheat tests out ok pump runs,system full !.Any ideas pls ?

 

[diamondgas]

Hi farenuf Do you knoe what you're doing? Open question to find out where you're competence is

Kind of limited in an open forum but it sounds like you've done some tests on the boiler components. Can I just clarify that you've tested the o/heat stat and that you had continuity?

 

[farenuf]

I sometimes wonder myself but yes gassafe reg,o/heat continuity is ok,pump running,clock switching,wall stat,ok and m/v moving with stat for c/h.Just cant get passed the o/heat obviously as it will not reset.40 yrs in this game my friend,but we dont always see past the end of our noses sometimes if wer human that is.

 

[Nostrum]

Have you checked the potentiometer is working correctly? 0-1M ohm I think on the 3 PFL?

 

[farenuf]

3 pin conectors tested for ohm 0-1 and 1-0 and cont at two pin tested with potentiometer off.

 

[diamondgas]

Checked wiring to o'heat mate? If stat ok then wring from pcb may not be.... at a guess No fan yeh?

 

[farenuf]

correct no nothing other than o/heat light

 

[zeebeedee]

Wiring or board got to be!

 

[southcoastboile]

I once had one of these with the pilot light on and did nothing at all, I assumed it was the PCB but turned out to be the gas valve. It sounds like it would be the PCB but just thought I'd mention it, may be worth checking gv resistance.

 

[farenuf]

Thanks to all for replies,Back to boiler tomorrow,will post when Iv sorted.

 

[diamondgas]

Thanks to all for replies,Back to boiler tomorrow,will post when Iv sorted.

Cheers farenuf When you get the chance check out this thread http://www.ukplumbersforums.co.uk/g...ate-gas-safety-registered-plumbers-forum.html ... We can discuss a lot more in the Gas Safe Registered ONLY forum TBH With this forum open to the public it's kind of ethical to keep technical stuff to a minimum if you know what I mean?

 

[Poxi]

Has it had a new PCB fitted and not worked since ???

 

[mightymark]

To be continued.......................

 

[farenuf]

New PCB fitted and working perfect.Old PCB had no burn markings at all but just behind Potentiometer slight whitening of upper side of old board covering several resistors.Think steam off kettle had caused droplets to form on bottom case of firebox and these droplets had fallen onto PCB via ill fitted front on control box.Thats my story and Im sticking to it.
Cheers to all for input.