I have refitted the replacement and now there is hot water on both side of the y valve i.e. heating/how water but so far none of the radiators are getting warm. The pump casing and the pipes above are all hot (see image) and if I put a screwdriver to my ear I can hear the motor running so the hot water is going somewhere but this stops as soon as the HW demand is turned off on the programmer
Honeywell v4073a1039 Y Valve Faulty???
- Thread starter old wrinkly
- Start date
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Before doing anything else, I'd check your wiring. Good visual of how it should be working here: http://octaveblue.co.uk/c_heating/
Thanks for two very instructive replies. It's clearly a wiring issue but not show what I have got wrong. I will compare both diahrams with my own to see if I can trace the problem and also draw my own current wiring circuit for comparison and post for further help if necessary.
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The colours of wires in a heating system mean absolutely nothing, never trust wire colours
Angry pixies (electricity) doesn't care what colour the insulation is 
Good morning
I spent all day yesterday trying to sort things out without any success and I have now spent a couple of hours this morning checking and double checking and cannot see what I have got wrong checking against the 2 diagrams provided.
I am no good at creating diagrams so apologise for having to list the connections in text form and hope you can make sense and that I haven't made any mistake! The only wiring I touched was the Y Valve.
Please note my numbering on the Honeywell Wiring Centre is the reverse of the norm i.e. 1 is far right and 10 first left so 1=10
MAINS 230V
Brown 1
Blue 3
Yellow/Green 10
V4073A Y-Valve
Red 9
Blue 8
White 4
Grey 6
Green/Yellow 10
HORSTMANN Centaur Plus C27
Black (tagged yellow)
Brown 2
Blue 3
Green/Yellow 5
BOILER
Red 4
Black 2
Blue 3
Green/Yellow 1
PUMP
Brown 9
Blue 8
Green/Yellow 10
ROOM STAT DT92E Wireless
Brown 3
Black 8
Grey 4
Green/Yellow 9
CYLINDER STAT
Brown 5
Blue 6
Green/Yellow 9
I spent all day yesterday trying to sort things out without any success and I have now spent a couple of hours this morning checking and double checking and cannot see what I have got wrong checking against the 2 diagrams provided.
I am no good at creating diagrams so apologise for having to list the connections in text form and hope you can make sense and that I haven't made any mistake! The only wiring I touched was the Y Valve.
Please note my numbering on the Honeywell Wiring Centre is the reverse of the norm i.e. 1 is far right and 10 first left so 1=10
MAINS 230V
Brown 1
Blue 3
Yellow/Green 10
V4073A Y-Valve
Red 9
Blue 8
White 4
Grey 6
Green/Yellow 10
HORSTMANN Centaur Plus C27
Black (tagged yellow)
Brown 2
Blue 3
Green/Yellow 5
BOILER
Red 4
Black 2
Blue 3
Green/Yellow 1
PUMP
Brown 9
Blue 8
Green/Yellow 10
ROOM STAT DT92E Wireless
Brown 3
Black 8
Grey 4
Green/Yellow 9
CYLINDER STAT
Brown 5
Blue 6
Green/Yellow 9
Last edited:
Hi, thanks for the reply. I have managed to get a better picture of the wiring which I hope will help you understand better and come up with an answer.
The black cable coming in from the bottom left is the new y-valve head can and to the best of my knowledge all I did was a simple one out one in, I shouldn't have touched anything else.
I am also trying to create a hardcopy wiring diagram but it's taking me time.
I have decided to ignore the numbering on wirine box and treat as standard i.e. number 1 is first left. For the y-valve this gives:Green/Yellow in 1, Blue in 3, Red in 4, Grey in 5 and White in 7
The black cable coming in from the bottom left is the new y-valve head can and to the best of my knowledge all I did was a simple one out one in, I shouldn't have touched anything else.
I am also trying to create a hardcopy wiring diagram but it's taking me time.
I have decided to ignore the numbering on wirine box and treat as standard i.e. number 1 is first left. For the y-valve this gives:Green/Yellow in 1, Blue in 3, Red in 4, Grey in 5 and White in 7
Attachments
Last edited:
Hi well I fitted it myself and it's not really possible to fit wrong, at least I don't think so as the screws wouldn't match up.
Going back to the wiring picture can you see anything that looks wrong. I could have made a mistake I suppose. If you need clarification on anything then please ask.
Going back to the wiring picture can you see anything that looks wrong. I could have made a mistake I suppose. If you need clarification on anything then please ask.
Problem with heating wiring is there are so many possible combinations, will 2 and 3 wire stats, some boilers supply the pump live, etc, without seeing the wiring requirements for everything, it's difficult to say what needs to go where. You literally need to go back to basics I think and work out what comes from where, to go where.
As said, colours are irrelevant as there's no standard practice, (I'm surprised multi cored cable is available for heating applications.) You list mains Live going into Terminal 1, but no corresponding output from there to the rest of the system?
As said, colours are irrelevant as there's no standard practice, (I'm surprised multi cored cable is available for heating applications.) You list mains Live going into Terminal 1, but no corresponding output from there to the rest of the system?
Very naughty of whoever wired that lot not to sleeve the green/yellow cores. Honeywell's web site is really rather good- try this https://ensupport.getconnected.hone...tyId=ka12G0000000ttJQAQ&field=File_1__Body__s and head for page 9 or so.
Before you swapped the head did you try powering down the whole system- according to the instructions from Honeywell, that should set the valve back to its default position (hot water only). Are you actually getting hot water at the moment?
Before you swapped the head did you try powering down the whole system- according to the instructions from Honeywell, that should set the valve back to its default position (hot water only). Are you actually getting hot water at the moment?
Thanks for all the replies which have been very helpful. After spending a long time bent over in the airing cupboard, and trying all the suggestions to try and sort things out myself my back has been giving me real pain (part of being older than I was) so I have decided that it has beaten me and I am hoping our heating engineer will call in later today and get to the bottom of things and get the heat flowing as my wife is now feeling very cold. A simple job on the face of it has turned into a bit of a nightmare.
Post a pic of the wiring inside your programmer please
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