Poor Circulation between boiler and boilermate 2000

Hi,

I have recenty had the glendhill engineer out as I had a fault with the switch heating unit and main circuit board fault, these have both now been replaced but having issues with heating, it takes an age to get up to temp, i.e store is up to temp, heating comes on drops to below 60c heating pump stops then when boiler eventually gets it above 60c heating comes back on, the boilermate 2000 is doing everything it should its calling for heat but the boiler keeps shutting off (with no error codes), glendhill engineers suspects power flow rate between boiler and boilermate and requires cleaning out, which they don't do.

I was just wondering what the best way to clean out the whole system including rads, boilermate, boiler and all pipework including to and from boiler and boilermate.

I was thinking of draining the whole system from lowest rad, putting some sludge cleaner in via the F&E tank in the loft, fill it back up with water, run it for a couple of weeks the drain again, was also going to inspect the flexible pipework when system drained down.

Does this sound right, if not please could someone advise.

Lee Tunstall

Yes you are right.
Remember 1 litre to every 100 litres.
So if unit is for EG; 150 litres that is 1.5 litres.
Plus the system which is 10 rads to a litre.
Mike

Thanks mike,

Ill get this sorted any recommendation for a good sludge cleaner?

Lee Tunstall

Nothing to aggressive.
About £10:00p per litre.
Mike

Lee,

I'm inclined to question the above diagnosis. I suspect your boiler is simply shutting off at too low a temperature leading to the Boilermate store only ever reaching a little over 60 degrees C. Then when the CH starts, the store temp rapidly falls and the interlock turns the CH OFF again.

Is your boiler a Potterton Suprima by any chance? If so this is a common fault with the new(ish) Siemens PCB in my experience.

A simple workaround for the problem would be to re-wire the CH pump so it is fed with power via the time switch and the room stat but not the Boilermate PCB. Then the CH stays on when calling for heat regardless of the interlock on the board. This will reduce DHW performance for a short while after starting the heating. Protection of DHW performance is the reason for the interlock in the first place.

Mike

Mike the Boilerman wrote:Lee,

I'm inclined to question the above diagnosis. I suspect your boiler is simply shutting off at too low a temperature leading to the Boilermate store only ever reaching a little over 60 degrees C. Then when the CH starts, the store temp rapidly falls and the interlock turns the CH OFF again.

Is your boiler a Potterton Suprima by any chance? If so this is a common fault with the new(ish) Siemens PCB in my experience.

A simple workaround for the problem would be to re-wire the CH pump so it is fed with power via the time switch and the room stat but not the Boilermate PCB. Then the CH stays on when calling for heat regardless of the interlock on the board. This will reduce DHW performance for a short while after starting the heating. Protection of DHW performance is the reason for the interlock in the first place.

Mike

Mike,

Thanks for your response

Yes it's a potterton suprima 60l, with a siemans circuit board (5102160) from my knowledge this has not been changed, it's been working fine up until a month ago.

The fault that we have is when the boilermate is requesting the boiler is firing but stops then starts back up again, so like you say I think the boiler thinks it's reached its temp so stops.

So would you suggest changing pcb in the boiler to resolve this?

As for the simple workaround I don't have an electrical background (I am mechanical fitter), but I do have basic knowledge, were would you suggest wiring it exactly, I've attached wiring drawing to this post (hopefully).

Also do think cleaning the system out won't resolve it, as when gledhill engineer drained some water off it was very black and this is what he suggested.

Thanks

Lee Tunstall

For some reason I can post the pic of the wiring but it won't let me, Ive also tried putting a link on and it won't let me, so can't post a pic of the diagram, as I was hoping that you could explain were to put the new wires.

thanks

Finally found the fault.

Drained whole system down and removed boiler flow and return flexible pipes and found them totally blocked aprart from 2mm hole in each, cleaned them out and refitted put some cleaner in and filled system back up and warmed tank up and bingo we now have heating and boiler now can keep up.

I now plan to flush the radiators and boiler out next week to get rid of all the sludge etc.

Lee tunstall

Hi Lee
6 years since you posted this message, just wondering if you had any issues when trying to remove the flow and return push fit flexible braided pipe connector from the copper pipe in the boilermate 2000 thermal store and if you managed to push flexible hose back onto pipe after. Gledhill no longer supply this flexible hose so just looking at all my options. Any help with this is much appreciated