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?

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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I did that. He was somewhat baffled.

Been away for 24hrs and been thinking about it and I wondered if the pump electronics might be causing an issue perhaps together with something marginal on the PCB.

I set it the boiler to come on at 7PM tonight and got home at 9 and it was running - and this is still with the original PCB in!

Well, this is all a bit weird - it's run for four days now with the original PCB fitted (a note I'd left with said removed in 2004). I've turned the power off and on and it came back on fine, without needing to be reset.

I want to put the 6mth old refurb and the new refurb boards back in and see what happens but I'm loath to touch it while it works!

On 06/02/2018 19:19, Rory wrote:
Well, this is all a bit weird - it's run for four days now with the
original PCB fitted (a note I'd left with said removed in 2004).
I've turned the power off and on and it came back on fine, without
needing to be reset.

I want to put the 6mth old refurb and the new refurb boards back in
and see what happens but I'm loath to touch it while it works!

Given its winter, "if it ain't broke, don't fix it" springs to mind!



--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

Certainly what I was thinking.

It was quite iffy yesterday. It started fine but then, unusually, went off at some point not long after. So it was cold when we got up, and I wasn't popular. I reset it and it started then cut out again a few mins later. Normally once it's going it runs until it hits the boiler 'stat.

After that it was fine all day. Today it ran perfectly until about 11.30 when I noticed it was going chilly and found it was flashing red. It reset and ran fine.

What's different about these faults from the usual Suprima lock-out is it's going straight to flashing red - it's not doing the 3 tries at igniting (or re-igniting).

I do need to bite the bullet and try the other PCBs again, as at least one of them has to be exchanged back to Geoff.

On Thursday, 8 February 2018 14:17:27 UTC, Rory wrote:
Certainly what I was thinking.

It was quite iffy yesterday. It started fine but then, unusually, went off at some point not long after. So it was cold when we got up, and I wasn't popular. I reset it and it started then cut out again a few mins later. Normally once it's going it runs until it hits the boiler 'stat.

After that it was fine all day. Today it ran perfectly until about 11.30 when I noticed it was going chilly and found it was flashing red. It reset and ran fine.

What's different about these faults from the usual Suprima lock-out is it's going straight to flashing red - it's not doing the 3 tries at igniting (or re-igniting).

I do need to bite the bullet and try the other PCBs again, as at least one of them has to be exchanged back to Geoff.

maybe tapping the pcb with a bit of plastic or squirting it with freeze spray couyld narrow down a bad joint


NT

Just thought I'd update this - I limped along with my original PCB. I had tried prodding it - a plastic baby spoon worked well! - and found two of the relays clicked when nudged, so a bit of gentle 'packing' helped them work..

I decided to bite the bullet and get another refurb board. Low and behold it worked fine.

Quite why the first replacement didn't work at all I don't know. I've read of this before with Suprimas but hadn't thought of it my case, I assumed the fault was elsewhere. I guess there's something about the parameters the board checks on power up and maybe some are more fussy than others.

Just thought I'd update this in case anyone finds it on a search.

I limped along with my original PCB during the recent cold weather. I had tried prodding it - a plastic baby spoon worked well! - and found two of the relays clicked when nudged, so a bit of gentle 'packing' helped them work..

I decided to bite the bullet and get another refurb board. Low and behold it worked fine.

Quite why the first replacement didn't work at all I don't know. I've read of this before with Suprimas but hadn't thought of it my case, I assumed the fault was elsewhere. I guess there's something about the parameters the board checks on power up and maybe some are more fussy than others.