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PostPosted: Tue Apr 17, 2018 6:36 pm 
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I have a Boilermate 2000 connected to a Potterton Suprema and Nest v3 thermostat. The Nest seemed to be working ok for a few weeks but now I seem to be getting intermittent periods where the boiler is CH is permanently on regardless of the thermostat.

If i adjust the thermostat I can hear the Nest Heatlink clicking on and off but the Boilermate CH pump keeps running and the combi boiler stays on. Basically the CH stays on.

The Heatlink (Nest Wireless box) is wired into the Boilermate Roomstat block -

Boilermate::Live ( Brown ) -------> Heatlink::Live + Linkwire to Heatlink::T1
Boilermate::Neutral ( Black ) -------> Heatlink::Neutral
Boilermate::Switch Live ( Grey ) -------> Heatlink::T2

The Heatlink 'power' turns on an off when the Boilermate switch on the timer is flicked on and off

Does this wiring look ok?

The single link for the Boilermate combi boiler switched live goes to a terminal block elsewhere and I assume this is ok as its the original wiring from the old broken thermostat


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PostPosted: Tue Apr 17, 2018 7:44 pm 
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If nothing has been touched since it was working ok I would suspect a faulty pcb in the Boiermate.

One of the most unreliable and expensive pcb’s (I should really call it an acb) known to man.

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PostPosted: Wed Apr 18, 2018 3:29 pm 
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Yes it was originally working fine and now its all over the place - I thought it was the heatlink and i have a replacement one on order from Nest,

But now the boiler is sometimes not coming on other times it comes and wont shut off. Are there any tests I can do to see if the Boilermate PCB is at fault - are there any error codes on the LCD or self tests I can do ?

Thanks


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PostPosted: Wed Apr 18, 2018 4:23 pm 
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Switch mains off to Boilermate, wait about 30 seconds then switch back on.

Sometimes doing this will then make the pcb come on with no display, proving it is faulty.

The only test I know of is one where you remove the jumpers and then put just one back on (you will have to look this up in the installation instructions as I can't remember precisely which one just now) and this then puts the pcb into test mode, but only really tests each pump is working.

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