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Thanks all sorted now , I sympathise my ”engineer” won’t do electrics , another engineer came out this morning and because the wires weren’t neatly in a line in a 10 way block would not touch and wanted £1k to rewire in a line or recommended ripping out the existing boiler not 12 months old and...

Hi Terry quick update after a long day…. Heating only with white separated out had 240V so concluded must be motor head so replaced. Also had a nightmare of a job but had to run a wire up from HW off on programmer into attic and down to airing cupboard to terminal 2 on cylinder stat and grey to...

perhaps roomstat used to be upstairs

Sorry maybe wrong would need to double check , I think they get 240v on activation of heating on not demand

Unfortunately not I ran a cable from terminal 1 HW off with power off up the stairs to airing cupboard and did continuity check on every wire and could not locate other end. I don’t know what these wires are it is a red and yellow in a block that only go to 240v when heating calls which seems...

From what I remember I think they could get heating only but not water and heating but maybe wrong, not sure sorry. I am confident all wires from programmer 3 and 4 and wires to and from stats are good as I have checked re-checked that’s how I found no HW off signal and the rogue 240v on white...

To be honest boiler is less than 12 months old, I don’t see how engineer ever had it working properly and old tenants never complained, new tenants in and they complained not working so here we are. He is on holiday, he says there’s an electrical fault but he doesn’t do electrics , he says he...

No Terry it’s an old programmer , it has a wire connected to HW off but I cannot find the other end of it in the airing cupboard anywhere. There was no wire from HW off connected to terminal 2 on cylinder stat and grey wire on valve so looks as if somehow I have to get a wire from programmer to...

Think you are right but annoying thing is that it is 4 weeks old……

Hi Terry dont know if you got previous reply, sounds logical will let you know how I get on tomorrow Thanks Steve

Got it perfect Terry thank you, will update you tomorrow

Hi it seems when cylinder stat calls and sends 240v on orange SW2 in diagram is in wrong position sending 240v also on white and I don’t think I can repair that. Does that make sense ?

Hi Chris I am the landlord, plumber now on holiday but he doesn’t do electrics ….. He fitted new boiler but doesn’t have HW off wire connected which I need to run a wire tomorrow. A temp wire got every thing I needed only this bizarre output on white that I don’t understand. I am thinking he has...

Yes that’s exactly what’s happening with hot water on I seem to be getting output of 240v on orange and white which is stumping me, all circuitry looks spot on White as an input from room stat is all functioning great but I get an output on it on hot water only along with orange. Am thinking...

With hot water only I get power to common of cylinder stat, as soon as the stat calls to heat up on terminal 1 the orange receives 240v to fire the boiler but simultaneously so does the white wire which goes to the call side of the room stat . Hope that makes sense but the heating only all works...

Yes that’s what I am thinking so that being the case does that not indicate that the MPV switching is not functioning correctly. If so is there anything that would cause that ? I cannot check tonight but could valve be connected incorrectly ie HW to heating and vice versa or valve being in manual ?

Thanks Terry it’s at a rental so cannot check until tomorrow. I have continuity tested the white and it goes to call side of room stat. The heating on its own seems to be fine. What are you thinking ? Would valve being in manual which I need to check tomorrow have any effect ?

Thanks Terry cannot test that until tomorrow, I know the white goes down to room stat call side. What are you thinking ?

Help got a Y type system, long story but plumber just changed motorised valve complete with motor so all new. Unfortunately he doesn’t do electrics. I have looked at the wiring diagram and checked everything through and found that the HW off wire did not connect to anything nor could I find it...