Recent content by vikdab

Viessmann advising me to connect a capacitor between orange and mains (they 1 and 96 - I think numbers relate to their board) Will let you how I get on

hi The wire is orange indeed. The two oranges from the 2 valves connected to black (switched live?) coming from boiler. It is same as before Both off = no volts Heating only = Red live HW only = Red live Both on = Red live This I believe is correct. The interesting bit is following. When I...

The problem with the old one was that the heating would remain on at night even though it was off in app (so same problem) but now it is happening ALL the time. I have had 2 boiler engineers but like you say I need an electrician with knowledge of boilers. From reading elsewhere it looks like...

I know the part is correct because it came with Honeywell documentation which says 40003916-003 is correct Replacement head. Strangely I did not have this problem when I had 40004805-001 . With that one the HW would not come on when CH was on The spring does bring lever back to mid position...

I got new actuator - the right one (40003916-003/U) . The manuals do make a reference to v4073a1039 so I'm sure it is the right one. However my CH does not turn off when I switch it off in the app (when there is no HW on). If HW and CH are on and I turn CH off it does work I think my NEST is...

Yes it works now. AT least the hot water bit However the reason it was replaced was that my heating was not turning off by itself at night (even though heating/hot water off in app) That problem has resurfaced! Didn't have that with the replacement I bought it as a like for like replacement on...

Hi I checked them again. Heating off HW on only - white did not have any voltage (i have edited my post above) - apologies my mistake I was wondering why the mid position valve was not behaving as it should. I replaced the new one with the old one (The old one was replaced because the...

Hi I agree the wiring looks like a complete mess. I did some tests On the NEST (on / off refers to the status in app) Heat Off HW off 1,2,4 and 5 are live Heating on HW off 2,3,4 and 5 are live Heating off HW on* 1,2,5,6 are live Both on 2,3,5,6 are live Above seems to suggest NEST...

The link you have included describes my set up 100 %. I'm not sure as to when exactly the problem started as the mid posn valve and heatlink were replaced at similar time and as luck would have it the engineers blame the other one. I will check the NEST wiring as suggested above. Thanks for...

Hello I have a nest third generation thermostat that was connected five years ago, The heat link died and google offered to replace for free. Around the same time another engineer replaced a mid position valve. I believe my system is neither s nor y plan (it has a mid position valve and a 2...