Boilermate 2000 ignores store satisfied temp.. T1_OFF

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Boilermate 2000 ignores store satisfied temp.. T1_OFF

Post  J0nny2000 on Sun Oct 02, 2011 6:01 am

scenario..

-store temp drops to or below the 'Store Calling Temp' T1_ON
-boiler to store pump starts, boiler fires.
-continues to fire and pump until store reachs and exceeds 'Store satisfied temp' T1_OFF.
-boiler has now reached it max temp so shuts down.
-boilerenemy2000 continues to call for heat, and run the pump despite the fact the store has reached or exceeded(1-2 degrees) the T1_OFF temp.
-pump will run and run, thus moving nice hot water from store round to the boiler, so losing heat faster than it needs to and wasting elec...this will run for hours and hours, slowly depleting the store of its heat
- this only thing that will snap it out of this state is to turn on the central heating or call for DHW. As soon as you do this (exactly as you do this, its like a switch) the call for heat stops. Then the boiler to store pump will go into its overrun stage and turn of a couple of minutes later. Finally peace!

Looks like a bug in the coding to me? Any ideas how to fix?

Any help would be much appreciated.

my two cents.....complicated electronics are needed for travel to the moon...not my central heating! A couple of manually set thermostats for T1_ON and T1_OFF is what this system needs...And a timer for heatstore operation times...boilermate2000, most wasteful system ive ever seen.


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Re: Boilermate 2000 ignores store satisfied temp.. T1_OFF

Post  Midland Boilercare on Mon Oct 03, 2011 5:44 am

Hi Jonny

From what you have described, it sounds like the main control board has a fault in the processor and requires replacing.
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Re: Boilermate 2000 ignores store satisfied temp.. T1_OFF

Post  J0nny2000 on Mon Oct 03, 2011 12:05 pm

Thats what i suspected. Complicated electronics and central heating don't and have no need to mix, pointless use of processors!

Do you think that removable chip in the middle is where the coding is, i think that may be an eprom chip, which can and do fail, perhaps i can just replace this one chip, or does the whole board come as one?

Any idea on prices for board or chip?

Thanks

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Re: Boilermate 2000 ignores store satisfied temp.. T1_OFF

Post  MK Group Ltd on Tue Oct 04, 2011 1:53 am

Hi,

I have never heard of replacing the chip on the pcb board, so would be interested in hearing about that?

New PCB would cost around £230.00 plus carriage.

Kind regards

Gary

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Re: Boilermate 2000 ignores store satisfied temp.. T1_OFF

Post  J0nny2000 on Tue Oct 04, 2011 2:17 pm

that chip on the front, the one with the version number on, is just a push fit, its not soldered to the board like the other chips are..im assuming so they could release updates of the coding...i'll see if i can source one. I suspect not. Gledhill not exactly a customer focused(Post sale that is!).

Doesnt seem to be hurting there business to much though, but if i replace this sucker it wont be with another gledhill!! I may keep the tank, it is bloody well insulated, but that board is going!!

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Re: Boilermate 2000 ignores store satisfied temp.. T1_OFF

Post  scorp on Thu Oct 13, 2011 8:10 am

J0nny2000, if you are good in electronics you can fix your PCB yourself. Or at least try with no harm. Yuo need to replace 5 electrolitic capacitors on the board 2x(10uFx50V), 2x(47uFx50V) and 1x(220uFx25V) but make sure you buy with at least 105C to survive in hot condition.
And FYI, that big chip in a socket is microcontroller with code programmed inside it. You are right about EPROM failure but it most of the time happens when data written often in it but it is not the case for this controller although it is possible to have corrupted code. The main problem is power on the board filtered by cap and if it is noisy then controller won't start or do weird things

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Re: Boilermate 2000 ignores store satisfied temp.. T1_OFF

Post  J0nny2000 on Wed Oct 19, 2011 1:42 pm

i might give that a whirl..!

At the moment ive turned down the pump speed to min, and im just letting it run. Sometimes a satisfied store temp will coincide with someone asking for hot water or a central heating call, in which case that will 'jog' the board into realising its satisfied. Sometimes it wont and it will run and run, but on min pump speed i dont notice it.

I will check my bills in three months see how they are looking. If there are bad i will try replace the parts you mentioned. Hopefully wont cause the problem to get worse.

Thanks for the info.

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Re: Boilermate 2000 ignores store satisfied temp.. T1_OFF

Post  m_costelloe on Sun Sep 17, 2017 1:49 pm

Cross reference to this post for capacitor part numbers:
http://gledhill-repairs.forumotion.net/t1219-continuous-heating-dead-acb#7762

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