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Great, thanks for all you help, guys. It was the HW actuator (head / valve switch). Cost me £60 instead of £600, thanks to all your guidance. If I could buy you all a Christmas beer, I would :-) Merry Christmas! Thanks again, Lance

Thanks Tony, I turned off the power to the boiler, removed the 522 body, turned the boiler back on, and it fired straight up. So it seems it must be either one of the valves, or otherwise the PCB on the boiler. How do I go about testing the heads and valves? I assume I need to do more than...

Hi Tony, Thanks for coming back to me. The first company services our boiler annually. When here two weeks ago, I mentioned that the boiler seems to come on during the night, then he noticed the boiler fire up while he was servicing it, when the CH and HW were off on the timer. So suggested...

The pump connected to our Potterton Profile 80e is running constantly. I first noticed it when I heard the boiler fire up at 2am, when both the CH and HW are off on the LP522 timer. I've had two engineers out from different companies. One said both valves (valve & head) and LP522 timer need to...