On 01/02/2018 12:02, wrote:
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 rest 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. Put the
very original (very first) board back in, powered on to flashing red
again but it reset and away went the boiler.

I'm trying to reset with CH & HW off at the programmer and with the
boiler stat off.

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.

Anyone have any ideas, please?

Asking Geoff at CET might be your best bet...


--
Cheers,

John.

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