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Ok done that and my CH has now come on so I have left the link between the two on for now. Just need to get a new actuator, looked locally and they are very expensive so it may be an Internet order.

OK I have disconnected the switched live out of the valve and measured the output, I am only getting 35v AC when the valve has moved so it looked like it is faulty. To be sure, I disconnected the wiring from the DHW valve and I know there is demand to heat up the water but I am only getting 9v...

I have 2 * 2 port zone valves. The CH one is a Myson MPE222. I could not make it to the plumber supplies before they shut at midday today. The actuator moves fine so I took it off but I cannot get into it cos of the stupid security screws. So I put it back on and tested what voltages I got when...

I thought the boiler would have stayed on if I took the thermister out of it's housing as it would only read the temperature of the air. I had a look at the valves and they look like they are working but I probably need to investigate a bit more.

I have a Potterton Suprima 50L that is 10 years old. I fitted a new PCB in May 08 to get rid of the known lock out issue caused by dodgy a PCB and it worked fine until a few weeks ago. I replaced the PCB again today and the fault has not gone away. The problem shows itself up when the central...