Do NOT do that!!!
If there is a fault on the circuit, it could have blown the existing programmer. You wouldn't want the same thing to happen to you own programmer.
How a mid-position valve works contains detailed fault finding info.
Three port diverter problem
- Thread starter Howardws
- Start date
If there is a fault on the circuit, it could have blown the existing programmer. You wouldn't want the same thing to happen to you own programmer.
How a mid-position valve works contains detailed fault finding info.
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No power from the CH on terminal and I've checked the wiring for continuity from the on terminal through to the valve.
It occurs to me that when my son told me his CH wasn't working I suggested that he gave the valve a bang in case it had stuck fron not being used all summer. This he did and the CH worked, but not the next time it was timed to start. I wonder if the bang could have caused a voltage spike that damaged the programmer?
I shall look at 'how a mid-position valve works' thank you.
It occurs to me that when my son told me his CH wasn't working I suggested that he gave the valve a bang in case it had stuck fron not being used all summer. This he did and the CH worked, but not the next time it was timed to start. I wonder if the bang could have caused a voltage spike that damaged the programmer?
I shall look at 'how a mid-position valve works' thank you.
Howard both of the above quotes suggest that the valve has motored which also means that there has to have been power on the white
the white is ultimately connected to the central heating on terminal which you are now saying does not have power.........
Matt
I can't go back to my son's until Saturday week so probably my best bet is to start all over again using D_Hailsham's fault finding info. Perhaps coming to it fresh will help! Thank you all for your input so far. I'll report back in ten days or so.
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Do you know when I said I'll have seen worse?........ 
seriously though, thanks for the pic, as it now puts a different slant on things.
The actual problem could lie within that wiring centre i.e a damaged pcb track
Identifying the cables will be a good place to start.
Matt
seriously though, thanks for the pic, as it now puts a different slant on things.
The actual problem could lie within that wiring centre i.e a damaged pcb track
Identifying the cables will be a good place to start.
Matt
The connections up the middle are earths at the top and neutral at the bottom. I'm unable to list the connections as they are shown in the photo so -
Top left hand strip
red from prog CH on
yellow to room stat
black from prog HW off
grey to valve
gr/yell from tank stat
Bottom left hand strip
white to valve
yellow from room stat
Top right hand strip
brown to prog
red live in
brown to tank stat
red from prog HW on
Bottom right hand strip
green to tank stat
orange to valve
brown to pump
yellow to boiler
I hope that's right!
Top left hand strip
red from prog CH on
yellow to room stat
black from prog HW off
grey to valve
gr/yell from tank stat
Bottom left hand strip
white to valve
yellow from room stat
Top right hand strip
brown to prog
red live in
brown to tank stat
red from prog HW on
Bottom right hand strip
green to tank stat
orange to valve
brown to pump
yellow to boiler
I hope that's right!
My comments in Green
The wiring seems to be correct at the terminal strips. However, we need to know which terminal numbers on the Room Stat and Cylinder Stat the various wires connect to, as well as the makes/models of both stats.
The wiring seems to be correct at the terminal strips. However, we need to know which terminal numbers on the Room Stat and Cylinder Stat the various wires connect to, as well as the makes/models of both stats.
I know what they are supposed to be DH, what I meant was, I have never seen a 3 core & earth cable containing 2 yellow cores, same as I have never come across a 3 core flex containing brown,green/yellow and green cores
Matt
I see what you mean, but I don't see how you can know, for certain, how many cores are in each cable - except the valve. It's very difficult to identify them from the fuzzy pic, even when it is blown right up, so we don't really know how many cables are connected to each item - Prog, Room stat, Cyl Stat.
A vist to my son's home today produced the following -
A better quality photo of the wiring
A photo of the room stat - there is nothing internally to identify it's type
The wiring is 1 - red, 4 - empty, 3 - yellow, 2 - blue, 5 - nothing
The cylinder stat is a Honeywell L641A1039
c - brown, 1 - blue, 2 - green/yellow
Thanks, Howard
A better quality photo of the wiring
A photo of the room stat - there is nothing internally to identify it's type
The wiring is 1 - red, 4 - empty, 3 - yellow, 2 - blue, 5 - nothing
The cylinder stat is a Honeywell L641A1039
c - brown, 1 - blue, 2 - green/yellow
Thanks, Howard
Now the pic is clearer (thanks), it's making even less sense.
Take the left cable at the top as an example, which, according to you, has:
Black - from prog HW OFF
Red - Live in
Brown - To tank stat.
The other end of the cable can't be in three places at the same time - Programmer, Tank Stat, and Mains supply. So where does it end up?
The bottom left cable is clearly marked "STAT", but you said the red comes from Prog CH ON.
Can you positively identify where each cable goes (apart from the black valve cable) and which terminal each wire is connected to at the other end?
Take the left cable at the top as an example, which, according to you, has:
Black - from prog HW OFF
Red - Live in
Brown - To tank stat.
The other end of the cable can't be in three places at the same time - Programmer, Tank Stat, and Mains supply. So where does it end up?
The bottom left cable is clearly marked "STAT", but you said the red comes from Prog CH ON.
Can you positively identify where each cable goes (apart from the black valve cable) and which terminal each wire is connected to at the other end?
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