Potterton Profile 80E pilot stays on

Chris_Fitz · 3 Jan 2007

Seem to have a problem with a potterton profile 80E where the pilot does not go out at all!

Basically, starting from a fresh start, boiler fires up no problem at all.

However, when the boiler reaches temp either on the room stat or more typically on the boiler stat the main burner goes out, but the pilot doesn't!

So when the stats click back in to fire up the main burner once more it doesn't light as the pilot is still on from the previous time.

Turning boiler off, turning off gas main, purging gas, turning mains back on followed by switched elec supply back on allows the boiler to fire up once more.

My question is, is this a faulty soleniod in the pilot gas valve or is it likely to be the pcb?

As on the potteron troubleshooting page it says if you get a cycling of the fan when boiler tries to ignite, which this does when pilot is on, then this is a pcb fault.

Any thoughts???

Cheers,
Chris

baxpoti · 3 Jan 2007

Chris_Fitz said:
As on the potteron troubleshooting page it says if you get a cycling of the fan when boiler tries to ignite, which this does when pilot is on, then this is a pcb fault.

Any thoughts???

Cheers,
Chris

You've answered your own question

Andygasman · 3 Jan 2007

How about the gas valve passing? if the pilot stays on the PCB with constantly be getting a rectification signal and so cause the cycling fan problem. If you repair the gas valve fault and the fan cycles, then change the PCB.

corgiman · 3 Jan 2007

doubt it

its either the pcb or the gao on the electrode is out try passing a pound coin through it.

I have only ever come across that problem with ideal classics andy, how many have you come across on a profile Andy as I like to learn new stuff

Agile · 4 Jan 2007

I have encountered a Profile with a first stage gas valve passing and keeping the pilot flame on ( sometimes ) or giving a smell of gas by the flue.

It did not work any differently though, and I dont see why it should !

If its does not work normally then I would expect it may be a different fault.

Since the first stage is powered by the PCB then if there is a fault ( stuck relay ? ) then it could be the PCB .

Tony

kevplumb · 4 Jan 2007

Agile said:
I have encountered a Profile with a first stage gas valve passing and keeping the pilot flame on ( sometimes ) or giving a smell of gas by the flue.

It did not work any differently though, and I dont see why it should !

If its does not work normally then I would expect it may be a different fault.

Since the first stage is powered by the PCB then if there is a fault ( stuck relay ? ) then it could be the PCB .

Tony

tony will you stop doing this

I AGREE

HarrogateGas · 4 Jan 2007

Ive had a few Profiles (especially the White Rogers Gas valve models) with the pilot passing and yes it does cause the the fan to come on and off if the pilot has remained lit.

Surely the obvoius way of proving is to check for voltage at the pilot solenoid. If voltage is present then it is the Pcb that is at fault if no voltage then its the gas valve.

ChrisR · 4 Jan 2007

The answer is in the first post.
The gas has to be turned off to put the pilot out, not just the power. If the lack of power put it out, then it would have been the pcb, but as it doesn't, it's the gas valve passing.

Hmmm, I would have bet a shilling that it would have been the pcb!

Chris_Fitz · 4 Jan 2007

Many thanks for everyones help on this. Am I right in thinking that you need to buy a complete gas valve assembly then for this? Part no. 907704, plus I imagine the gasket and o rings, 212105 and 401637.

geoff@cetltd · 4 Jan 2007

Why is it so difficult to put a DVM on the solenoid and see if the pcb is actually powering the gas valve?

pannierstan · 5 Jan 2007

raden said:
Why is it so difficult to put a DVM on the solenoid and see if the pcb is actually powering the gas valve?

what a useless bunch of bandits you are

Bandits with experience Radon.

They are infact taking the facts and suggesting a cause.

You could if you were there indeed put a meter across the valve but alas you will come to the same conclusion because the bloody power is off and the pilot is still on

Why then would you want to check the valve with a meter.

Agile · 5 Jan 2007

Because its quicker to do the test by turning off the mains power to the boiler.

The other test is quick to do by turning off the gas to the boiler but its irrelevant as the first test establishes the cause.

It was a little embarassing the one that I found because I had only been called to do a cheap service and the fault I discovered meant it was a £200 repair needed.

Tony

pannierstan · 5 Jan 2007

ChrisR said:
The answer is in the first post.
The gas has to be turned off to put the pilot out, not just the power. If the lack of power put it out, then it would have been the pcb, but as it doesn't, it's the gas valve passing.

Hmmm, I would have bet a shilling that it would have been the pcb!

Chris I went to a Profile with an intermittant problem like this and unfortunalty the bright sparks before me had fit a fan, pressure switch and then 4 PCBs

I arrived with the 5th PCB and decided that was enough. Watched the boiler for 30 mins, hey presto.
Must admit had it a number of times but always on the white rodgers valve, never on the Honeywell red solenoid type.

Stan

geoff@cetltd · 5 Jan 2007

I wouldn't, because I am a professional and have a clue

although not in standing in front of a dead boiler without a clue

checking the valve with a meter - to see if the solenoid had the correct resistance (although that would be an indication, not an absolute test)

geoff@cetltd · 5 Jan 2007

pannierstan said:
ChrisR said:

The answer is in the first post.
The gas has to be turned off to put the pilot out, not just the power. If the lack of power put it out, then it would have been the pcb, but as it doesn't, it's the gas valve passing.

Hmmm, I would have bet a shilling that it would have been the pcb!

Click to expand...

Chris I went to a Profile with an intermittant problem like this and unfortunalty the bright sparks before me had fit a fan, pressure switch and then 4 PCBs
I arrived with the 5th PCB and decided that was enough. Watched the boiler for 30 mins, hey presto.
Must admit had it a number of times but always on the white rodgers valve, never on the Honeywell red solenoid type.

Stan

and people here get peesed off when I have a go at CORGIs for not being competent

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Potterton Profile 80E pilot stays on

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