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Hi Jackthom, The 3 blues are in no 4 which has a 240v feed, I moved the grey from no 4 to no 2 with the other one. Now I can confirm that when I switch each valve to manual, the boiler fires but then switches off because I believe there is an issue with the pump circuit. The pump is on...

Have a testing breakthrough this morning. This image shows the readings I am getting. The pump does seem to be on when the boiler is on but not the timer, and I am getting 150v across the blue and brown pump wires (terminals 3 & 4 on the right). I am puzzled by the 100v reading on my unmarked...

Click on my username, the diagrams are in my album, or below as have just worked out how to show them.

PDF of my interpretation of the wiring block now uploaded as a jpeg (what have they got against PDFs huh!)

Voltage is measuring 150v, takes quite a bit of wiggling the probes to get a reading

I have uploaded 2 pics to my wiring album, is that how to do it? Bear in mind that nothing has been rewired, and we have successfully installed a replacement valve previously, using like for like connections but the block is tricky to work with and looks nothing like the standard S plan...

Thanks to everyone for their input today, I have just got back from work and will follow your suggestions. The pump was replaced today as we thought it wasn't working, (not my idea!) but it was v old and noisy and didn't seem to be operating. This is where we are at moment. When the...

jackthom, I have drawn a wiring diagram of my set up and it is not close enough to the diagram you gave me to compare. I thought that the sequence was timer comes on, powers stat which powers valve then pump & boiler, is that correct? I've dug out my multimeter (needle type not digi) but...

Your guess is as good as mine! I love the diagram, if only it looked like mine it would help. It is based on the same system tho and is really useful. My two greys are not in the same teminal block like that, and I feel like they should be, one of mine is in with some blues, I don't like it...

The pump is connected to an extrenal wiring block. It doesn't come on when we push the valve to manual - but the boiler fires for a bit. If the pump was faulty, would this stop the valves working automatically, and if so how? Only had one of those screwdriver testers to hand last night, looked...

Hello, can anyone help me. We have a potterton prima 50e which was installed about 20yrs ago. After some overheat thermostat cutting out problems last year we replaced the 2 port CH valve, so when the same thing started to happen again this year we replaced the (original) HW valve (as a...