Recent content by bob1956

After checking again bob1956 said: should read 2 on cylinder stat -orange on zone valve & linked to L on boiler My bad. Just to add the HW is not permanently calling for heat , it just comes on randomly at different times to how I have scheduled it . The orange wire is not permanently live.

Thanks guys for your input , Ill double check later at the orange wire, are you saying if the orange wire in connected to a permanent live that is why my HW is coming on randomly ?

I have the nest 3rd gen; stat, running with a heat only boiler (Vaillant) on a Y plan system. Cylinder stat -Honeywell L641A1039 3 way motorised valve Danfoss HSA3. The problem I have is with the HW scheduling, I have scheduled HW twice a day 1 hr each time, ie; 0700/0800 & 1700-1800 However...

I didn't say there are 2 wires connected to the same terminal

Thanks for the replies, Just to add I am using a nest thermostat Gen 3 Danfoss 3 way valve is connected thus Orange -#1 cylinder stat.Blue- Neutral. Grey #2 cylinder stat. Brown/White -#3 heat link (heating on) I have the Heating stat wire unconnected at this time

hi I just replaced mu 3 port valve with the above valve, Wires are Blue,Orange,Grey, Brown/white,(4 wires), (I have no wiring diagram) When calling for heating, I get hot water,clearly I have 2 wires connected incorrectly . My question is, Which wires have I got wrong.:eek: Thanks

The hot water on the above boiler is running cold showing S53,only one fault code showing F22,I suspect that's historic. I have just changed the programmer because the original fault was no heating,which fixed that problem. However the customer asked me to check the HW supply it was then I...

Thanks Agile can you clarify which wire goes where(see attachment) as I dont want to damage the board

Ok Iv run the cable in as you pointed out ,my head is fried now just to clarify the orange wire connects to 240v or the RT, on the boiler And thanks for your help

Yes sorry you are correct,my bad I have connected as you rightly say

The nest has been wirered as per MI LN, link from L to 2 & 5 on heat link 3 to heating on 4 to HW on 6 to HW off Heat Link fitted 1 mtr from Stat.

Its on a y plan

No the pump is connected to x14 on the board. Should the pump be connected as per diagram

Is this the connection you mean