Potterton Netaheat 60e main burner not coming on

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Hello,

I'm glad to have stumbled on to this forum... I've done a search of the threads already, but can't find a similar problem to the one I have... I was hoping for some help...

I have a Netaheat 60e LPG boiler that is not switching over to the main burner after the pilot has lit.

More fully (I'll try and be brief...): On return from a weeks holiday, I switched on the heating, the correct series of noises came on (as I've read about on other threads) - the pilot electrode was sparking away, but no ignition. I took apart the pilot injector and gave it a clean... now I do have a pilot of sorts (I don't know if it looks OK as I've never studied it whilst it was working). However, even though I have a pilot, the electrode continues to spark, the tip of the pilot (the hat?) glows red hot and that's it... the main burner does not come in at all.

Any advice would be appreciated. I do have a couple of questions though:

1) how many holes should there be in the pilot injector - I can see through 2, is there a 3rd or is it just a divot I can see next to the other 2?

2) how does my boiler know when a pilot flame has been established? I cannot see a thermocouple or feedback mechanism to tell the PCB to start the main burner

The PCB was replaced about 3 or 4 years ago, I'd like to think the problem isn't there... I suspect the issue may be with my pilot flame not being nice and uniform as per the diagram in the service manual, it's a bit "hairier" than that... I'm baffled by the sensing mechanism...

Cheers,
Duncan.
 
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2) how does my boiler know when a pilot flame has been established? I cannot see a thermocouple or feedback mechanism to tell the PCB to start the main burner

the ignition electrode is also the flame sensing device :idea:
 
Could simply be a contaminated pilot, when was it last serviced, correctly.
 
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The netaheat is definitely not a boiler to do diy on; it is on the list of boilers to be extra careful with due to its design.
From your description, I suspect the boiler has not been serviced properly, and is producing large amounts of CO as a result. Just as well that it doesn't come on, as they could well be leaking into the house with potential lethal results.

Do NOT use, get a RGI in to service and repair it.
 

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