Replaced ACB but store not triggering boiler (T1_ON=0)

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Replaced ACB but store not triggering boiler (T1_ON=0)

Post  culversr on Wed Jan 14, 2015 1:23 pm

Hi,

After following excellent advice on this forum I've just replaced the ACB of my BM2000 system (heating was on semi-continuous & ACB not responding to SW1/SW2).

The new board boots up OK & I can now interrogate the temperatures via SW1 & SW2 for example.

But. I can't make heating work & the thermal store is not triggering the boiler to keep the store hot. I see from the thermal store_T1 values that T1_on and T1_OFF are both zero - which might (?) explain why that's happening?

The store is now at 52 degrees and dropping.

I've tried resetting using jumper 5 (turn off, apply J5, turn on, wait, turn off, remove J5, turn on)

Any ideas?



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Re: Replaced ACB but store not triggering boiler (T1_ON=0)

Post  mike on Wed Jan 14, 2015 3:32 pm

Heating will not run if the unit is below 60c.
Is your boiler on MAX.
Mike

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Fixd - I think

Post  culversr on Wed Jan 14, 2015 3:34 pm

OK, Apparently fixed - the replacement ACB was originally from a Gulfstream 2000. I eventually swapped out the EPROM from the new board & replaced it with the one from my old board.

Immediately booted up OK & seems to be working.

so, to answer questions posed by others, you *can*, it seems, swap out the EPROM (the big pluggable chip) from one board to another.

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Thanks

Post  culversr on Wed Jan 14, 2015 3:36 pm

Cheers Mike - replies crosssed in the ether.

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Re: Replaced ACB but store not triggering boiler (T1_ON=0)

Post  mike on Wed Jan 14, 2015 3:42 pm

Yes but not easy to change.
And watch the static!
Mike

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it's a fair cop

Post  culversr on Wed Jan 14, 2015 4:01 pm

Yup. Anti-static strap recommended - and even with a little experience i managed to bend a pin, d'oh

so, much care needed if anyone tries this. I think others have said that it's possible that the Rom (I guess it's an EEPROM) can be corrupted, but mine seems fine (so far)

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Re: Replaced ACB but store not triggering boiler (T1_ON=0)

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