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Thanks for all the advise, it's very useful. I've arranged for the Potterton Engineer to visit on Friday at fixed price £329. Includes parts and labour and 12 month waranty on valves and pumps etc, so if they do have to replace the PCB it's probably a reasonable price. I'll ask him to check...

I've attached a sketch of measured voltages in my album, click on dingers

Hi Tony, if you are still there. On the boiler terminal, with the live wire to the pump removed there is no output voltage between the pump live terminal and the earth when the boiler is fired up, so I think this confirms your diagnosis that there is a problem with the boiler, probably the...

Central heating system

Hi Simond Thats confused me a bit. I was measuring the voltage at the terminal inside the boiler, but with the live wire to the pump connected. There is no neutral or earth connected to the boiler pump terminal, the neutral and earth to the pump come from the terminal block in the...

Hi Tony Thanks for all your advise, it sounds too tricky for me to tackle I'll contact a RCE tomorrow, but at least I know understand the problem

Ok thanks for the advice. How easy is it to replace the PCB on the Potterton 60L. According to the instructions the control boeads rotates down at 45 degrees. Do you need to take it competely off to replace the pcb?

The voltage to mains at the boiler is 240V. The voltage between neutral and earth is 0 volts. With the CH programmer set to CH/HW on, or CH on only, or HW on only, the voltage to the pump from the boiler is 108V With CH programmer set to CH and HW off the voltage at the boiler to the...

Yes, there is 240V on the orange wire coming out of the 3 way valve

Thanks for the reply. There is power at the pump but only the same 100V from the boiler. If I have the pump running independantly but continously the CH & HW seem to work Ok. It seems to me that it is the PCB but not 100% sure

Just wondered if anyone can help. The CH pump is not coming on when the boiler fires up. The pump works ok if I wire it independantly. I'm only reading 100V from the boiler terminal to the pump (240V pump). Is this a problem with the boiler pcb or is it something else? The boiler is a...