This used to work perfectly until recently. Nothing has (knowingly) been changed since it was working. There was a room thermostat but I bypassed this during renovations by joining both brown wires (L and SL) and insulating the earth and neutral. This was bypassed long before this fault developed.
I have a Potterton Suprima 60 boiler for CH and HW which are individually controlled by the programmer. I have a Myson motorised 2-port valve at the boiler (for CH) and same next to the upstairs cylinder.
The boiler and programmer are about a year old, the valves etc. were installed by the previous owner.
A picture of my boiler can be seen here http://126.96.36.199/boiler.jpg
Does this sound like an electrical or perhaps a PCB problem? The status light does not change colour when I turn on the CH alone. Another thing that's weird is the reset button doesn't seem to do anything, on my old boiler this used reset the boiler if I pressed it when running.
I'd rather not have to get my plumber out if I can avoid it so any advice would be much appreciated.