BM2000 wiring question

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BM2000 wiring question

Post  Rich01 on Mon Apr 24, 2017 1:15 pm

Having just needed a new pump and circuit board for my bm2000, I have had the manual out and been looking at how it all works.
The bm2000 has been installed with a permanent live connection to the boiler (classic slimline se9 ff) and no switched live connection, ie terminal 6 is connected and terminal 7 isn't. Is this correct?
Everything seems to work ok, but the boiler switches itself on even though there is no demand from the bm2000.

Many thanks in advance.

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Re: BM2000 wiring question

Post  mike on Thu May 04, 2017 12:12 pm

Boiler does not run according to demand as such.
The BM will ask for heat if & when the unit temperature drops approx 8 to 10 degrees.
So you could wash your hands and the boiler will not work.

Check your boiler book ref wiring
If in garage the boiler might have frost stat.

If all works can not be far out. Been like it a good while?

Mike
MGC/H2O
Norfolk

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Re: BM2000 wiring question

Post  Rich01 on Thu May 04, 2017 1:17 pm

Hi, thanks for the reply.
The boiler is in the kitchen, so no frost protection. The boiler manual isn't very helpful. The closest it gets is to say to wire timers in series.
Without the radiators on, the bm is calling for heat every 11 hours or so. The boiler is firing every 15 mins.
It's about 12 years old, but it's had 2 boiler pumps and 2 circuit boards. Maybe when one goes it takes the other with it.
I'll swap it round to a switched live and see how it goes. I've got 12 years of gas readings to compare it against!

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Re: BM2000 wiring question

Post  DSHeat on Tue Jul 04, 2017 6:05 pm

Quite common for pump to take out PCB. Is your boiler temp set at maximum? It should be.

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Re: BM2000 wiring question

Post  Rich01 on Mon Jul 24, 2017 2:04 am

Boiler is on max.

I've taken a couple of meter readings now, and they have been the lowest (by quite some way) over the 3 years that I've checked. Both gas and electricity.
Presumeably the difference won't be so great in the winter with the central heating on.

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Re: BM2000 wiring question

Post  Warp_speed on Wed Nov 29, 2017 9:53 am

For what its worth I had the same issue, the boiler should be on the switched live and not the permanent, otherwise the boiler will fire up every 10 mins to heat up the water contained within the boiler and pipe. The switched live allows the BM to switch the boiler on when the thermal store requires heat. I had the same issue and it cost me the boiler fan, a pump and £300 a month on gas to realise the house builder couldn't wire a plug.

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Re: BM2000 wiring question

Post  Seany108 on Thu Nov 30, 2017 11:45 am

This sounds like the issue I’m having ? Just moved into the house a week ago , noticed the boiler is firing all the time and no pump coming on , what do I need to look for on the boiler mate , any pictures would help !

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Re: BM2000 wiring question

Post  mike on Sat Dec 02, 2017 10:37 pm

If you look at BM 2000
You will see cables going into connector strip.

You are looking for the boiler group

Your boiler may require a permanent live. Marked on unit

But there must and will be a switched live. Marked on unit

Boiler will also have neutral and earth.

Mike

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