The Potternton EP2002 is a timer control unit for a boiler, mine being a Prima F. I came home to discover I could not manually press ADV, which would normally activate the HW or CH, this is confirmed by the red colout LED on the right hand side illuminating.
Nothing illuminates at all, but the the time is displayed and is correct.
I also discovered that I could not set the time, or modify any other settings on the timer unit.
I removed power to the unit, (fuse isolation) and waited until the LED displaying the time faded. But when I turned it back on - SAME symptoms, I also noticed the time was exactly the same. So either this unit has a large capactitor in there, or a back up battery keeping the time backed up... I don't know.
I do know that I cannot control my heating.
Should I simply change the unit?
Regards Ravi Tek :(