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Yes, but the RGI already did that, but I couldn't figure out why the fan stopped if there was a supply to it, hence checking at the fan end. Things have been made plain to me now, I will not be doing anything inside the sealed boiler casing. The RGI will come back if I can get a diagnosis of...

Thanks both, Now I am aware I will not take the casing off again.

Thanks for that clarification, yes the boiler casing is sealed and many notes in the servicing booklet about it. I have worked on the foam, and straightened a few dents in the casing edge. Now I'm unsure whether I should have taken off the casing. I can access most components without removing...

Thanks 112, My normal reaction to check this out would be to run a temporary cable from the pcb output direct to the fan as a test. But I'm not sure now what I can do as not gas safe. Can I open the boiler casing and check out circuits?

Hello Slugbaby, Missed your question about bleeding a rad, Yes there is a lot of air and it takes a few minutes to let it out, but I only open the bleed screw about 1 turn.

Sorry, Didn't realise that. I thought if I left gas pipework alone I was OK. Didn't go into where the burners are just into the boiler casing. My reference to the heat exch fins was to indicate the place, I didn't see or feel them, just the s shaped pipework that is on each side. Won't do it...

Hi Slugbaby, Thanks! I didn't see your post till too late. Header tank and float OK. Drain down seems fine, but I opened bleed valves on the rads. It is a grundfoss pump, prob 114 yrs old and I took no notice of the colours, just surprised it seemed OK. My thoughts are that as none of the...

Many thanks for your input. Tried it first thing this am after it had been completely off overnight. It ran for 1m 45sec then cut out for 3mins. I let it cycle a few times and it returned to it's 30 sec runs then 3-4 mins resting, so decided to take the advice to check the pump. Drained...

Not so sure the fan is running on now need to check again in the morning. Thanks for all help so far.

I've let the boiler continue to do it's own thing for a couple of hours and it has heated the rads to a medium temp I can hold my hand on but hot enough to turn the gas fire off. It's still cycling on and off.

Deleted as I realised I was grasping at straws.

Yes boiler stat is at max. No banging, no overheat trip. Just dashed outside after a shutdown, fan is definitely running on there was steam coming out with some force.

Forgive my lack of knowledge but if the pump wasn't doing it's job I guess the shutdown would be caused by the overheat cut out. On this boiler the o/h cutout is manual reset, and it isn't tripping.

Thanks, I've experienced similar in a previous life. But I guess there's no easy check for that?

Power is definitely at the fan till boiler shuts down, evidence is the plume of steam at the exhaust. Is the any kind of cutout built into the fan?

No, Pipes and pump remain hot. Is this a sign pump is not pumping? It is definitely spinning though.

OK found it now.

I'm not familiar with this forum, please tell me how to "Watch" this thread.

As far as I can say, yes, he had his multimeter probes in the pcb connector. Obviously it wouldn't have been wise for me to interfere then. But I saw 240v reading.

I realise the problems with spares etc on an old boiler but it's in good nick generally and a new boiler would involve upgrading gas supply from half inch to 3 quarters, it's under a concrete floor from front to back of house with no real alternative route for pipework. It's the wrong time of...