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Boilerman thanks for the info, the numbers on my selectos are D11A36/4981, if that helps. I always mark or photograph things when taking them apart, a left over from my mechanics days.

Thanks for the reply Terrywookfit, Its a Selectos. Interested to know how cleaning nozzle with air line makes it worse? It's running at the moment but the flame doesn't sound right.

Hi all, I have the above boiler its a 20/25, this morning the flame out light was on, after resetting it would run for a short time and then flame out again. In the past this was due to dirt and dust accumulating around the jet so I cleaned the exterior and replaced. No change, took the jet...

sorry orange in 7 grey in 8, typo

It is connected to a separate connector block effectively used as 2, I think. We always thought when this was installed that it looked a bit weird, but it worked fine for 14 years.

Ok here we go: Boiler br=6, bl= seperate connector block effectively 2 gy= ; ; ; 3 Frost stat gy=5 br=2 bl= ; ; ; 2 cyl stat bl=8 gy=7 br=6 MPV orange=8 gy= ; ...

Just notice when I switch the boiler on after leaving the whole system off overnight and it seems to operating normally? any ideas.

Yeh your right, a mess, I think this one has beaten me, will make a call on Tuesday, thanks everyone for your help.

Here is a picture of the wiring center. The original installer used the vertical connector blocks as terminal 2 and 3, the only deviation from a standard fitment I can see is the addition of a frost stat.

OK, wiring configuration is as follows: MPV white=5, green=8, orange=7, blue=2 and gren'yellow=3, cylindersat: blue=(s)8, Brown=(c)6, Green/yellow=(h)7, as per lifestyle wiring diagram. Its quite possible its something I've wired incorrectly, question is what, I replaced each wire one at a time...

OK thanks guys for your continuing help, definitely set to P and new MPV fitted, system was working before it tripped the earth switch in the mains fuse box. Dripping MPV replaced as was cylinder stat and new programmer. It seems as though terminal one is supplying the juice to the boiler to...

OK, thanks Boilerman2, any ideas why this terminal is giving live all the time?

Can anyone tell me if terminal 1 of an acl LP522 should be live regardless of whether it is set to 'on' or 'off'. Currently I have HW on all the time. This a new programmer, thanks.

Its a new ACL programmer!

Update, have just advanced the heating to see if that works ok and it does, problem is that when I turn the heating off the mid position valve does not return to HW un less I turn power of then on again.

I bet you were down out of that loft quick smart! Well I have checked the wiring according to the Drayton wiring diagram and all looks ok. Still have the problem of the boiler cycling on during the day when the programmer says off. When its timed to cycle the pump doesn't come on either. Is a...

Hi, well I have just replaced the programmer and thought all was ok until this morning when the boiler came on again when program said off. I have managed to find out that it is the tank stat which is calling for heat, has anybody any ideas as to what the problem might be?

Many thanks for the reply, I have just removed the frost stat but have the same problem so it looks loke the programmer is the culprit.