Continuous heating = dead ACB?

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Continuous heating = dead ACB?

Post  JamesKemp on Fri Jul 13, 2012 9:19 am

If I turn my boilermate 2000 off, leave it unpowered for a while and then turn it back on, all is well for a while but as soon as I draw hot water the central heating comes on full blast and stays on regardless of the clock or thermostat setting. I suspect the control board is kaput especially as the LCD is completely blank whatever button I press. It looks fairly straightforward to put a new one in but I am reluctant to do so unless I'm sure it fixes the problem (the ACB seems a tad pricey), so to put my mind a rest a little I wonder if someone could answer a couple of questions:

Do the boards just break, or is there likely to be some external problem that should be checked out first.
What do the jumper settings do, the manual says use positions 1, 3 & 4 but my boilermate has only position 4 and must have been like that since new 8+ years ago.
The board has four LED (one per pump plus one not used), all of mine are lit all the time, even the 'not used' LED. Is this normal?

Anything else I should be concerned with?

Many thanks for any help ...
James

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Re: Continuous heating = dead ACB?

Post  mike on Fri Jul 13, 2012 1:54 pm

Jumper settings are very important.
Your PCB has gone.
Power surges / lightening are the main causes.
DO NOT TOUCH THE NEW PCB use gloves or what have you.
Mike
MGC/H2O
Norfolk

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Re: Continuous heating = dead ACB?

Post  scorp on Mon Jul 16, 2012 5:28 am

James,
It reminds me the situation with old Sky boxes when you have them on for years then decided to change some wiring's unplugging box from mains. After that box doesn't start. It is electrolytic capacitors issue. Check my answer here how to fix it: http://gledhill-repairs.forumotion.net/t957-boilermate-2000-ignores-store-satisfied-temp-t1_off#3035
I had nearly the same problem: http://gledhill-repairs.forumotion.net/t969-pcb-fault-fixing
Unless correct jumpers fix the problem(but I suspect you had working unit with the same settings for years and didn't touch jumpers)

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Re: Continuous heating = dead ACB?

Post  RichB14 on Mon Jul 16, 2012 1:31 pm

scorp wrote:James,
It reminds me the situation with old Sky boxes when you have them on for years then decided to change some wiring's unplugging box from mains. After that box doesn't start. It is electrolytic capacitors issue. Check my answer here how to fix it: http://gledhill-repairs.forumotion.net/t957-boilermate-2000-ignores-store-satisfied-temp-t1_off#3035
I had nearly the same problem: http://gledhill-repairs.forumotion.net/t969-pcb-fault-fixing
Unless correct jumpers fix the problem(but I suspect you had working unit with the same settings for years and didn't touch jumpers)

Hi Scorp,

Where can you get these capacitors from ?
Sounds like they could be a possible solution to my issue

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Re: Continuous heating = dead ACB?

Post  scorp on Mon Jul 16, 2012 2:49 pm

Here it is(don't pay attention on the values on the pictures):
220uF x 25V
10uF x 50V
47uF x 50V
or from Maplin

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Re: Continuous heating = dead ACB?

Post  RichB14 on Wed Jul 18, 2012 1:41 am

Excellent, i'll get some ordered up

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RS Part numbers

Post  RichardJ on Fri Oct 26, 2012 1:14 pm

Thanks for the advice I've replaced the caps and now have both a working spare and one on the boilermate.

I ordered parts from RS and got five of each capacitor for a total bill of around £4. The part numbers are:

3150552 220 microF
3654240 10 microF
572198 47 microF

Not bad eh, £400 worth of boards fixed for £4!

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Re: Continuous heating = dead ACB?

Post  scorp on Fri Oct 26, 2012 4:05 pm

RichardJ wrote:Thanks for the advice I've replaced the caps and now have both a working spare and one on the boilermate.

I ordered parts from RS and got five of each capacitor for a total bill of around £4. The part numbers are:

3150552 220 microF
3654240 10 microF
572198 47 microF

Not bad eh, £400 worth of boards fixed for £4!
Richard,
That is really good news. Glad that my advice helped someone

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Re: Continuous heating = dead ACB?

Post  Nige_S on Sun Apr 27, 2014 5:59 am


I seem to be having similar problems with my Boilermate 2000 where my heating started coming on at random times.....
I checked the ACB, all 3 pump LED's were constantly on and the digit readout was "ON.". I turned the power off and left for a few mins but the digit readout now doesn't come on and pressing the buttons does nothing. The 3 pump LED's still on. Also, the heating now seems to be permanently!

Order now placed with RS so hopefully this will be a cheep fix.

One other thing that's not related was that I noticed was that my GlowWorm boiler's thermostat was not set to max. Is this something I should change as the manual says the boiler should be set to max?


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Re: Continuous heating = dead ACB?

Post  mike on Sun Apr 27, 2014 12:31 pm

Main ACB has failed.
And YES
The boiler stat needs to be on max.
As the BM 2000 will tell it when it is happy.
Oh and you use more gas having it on lower.
Mike

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Re: Continuous heating = dead ACB?

Post  Weeguy on Thu Jul 27, 2017 1:41 pm

Another processor brought back to life by changing 5 caps. Thanks

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Re: Continuous heating = dead ACB?

Post  scorp on Thu Jul 27, 2017 1:52 pm

Weeguy wrote:Another processor brought back to life by changing 5 caps. Thanks
I'm glad it helped people save some money :). My boiler has been working for 7 years since I fixed it by changing caps.

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Re: Continuous heating = dead ACB?

Post  m_costelloe on Sun Sep 17, 2017 1:48 pm

The caps worked for me too, it's a 16 year old controller that now works again and doesn't give undemanded heating. Thank you, particularly for the part numbers.

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Re: Continuous heating = dead ACB?

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