Has worked fine for some time with its latest refurb board from CET but out-of-the blue failed to start the other morning.
As I still had the very first PCB the boiler came with (changed due to usual intermittent lock-out issue) I put that in and hey-presto, it worked!
However, when I first turned the mains on I was getting a flashing red. Pressed reset and away it went.
Got another board from CET this morning, put it in and same flashing red light on power-up and I can't get the board to reset. I'm trying to reset with CH & HW off at the programmer and with the boiler stat off.
Put the very original (very first) board back in, powered on to flashing red again but it reset OK and away went the boiler. Been running (and has gone on and off) for a few hours now.
The fault finding flow chart says things like check pump wiring isn't reversed but it's worked fine for years and indeed is running at the moment. The pump is an electronic one and should show a fault code if there's anything wrong with it.
As I still had the very first PCB the boiler came with (changed due to usual intermittent lock-out issue) I put that in and hey-presto, it worked!
However, when I first turned the mains on I was getting a flashing red. Pressed reset and away it went.
Got another board from CET this morning, put it in and same flashing red light on power-up and I can't get the board to reset. I'm trying to reset with CH & HW off at the programmer and with the boiler stat off.
Put the very original (very first) board back in, powered on to flashing red again but it reset OK and away went the boiler. Been running (and has gone on and off) for a few hours now.
The fault finding flow chart says things like check pump wiring isn't reversed but it's worked fine for years and indeed is running at the moment. The pump is an electronic one and should show a fault code if there's anything wrong with it.