What is normal

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Post  Stephen on Fri Jun 22, 2018 1:05 pm

Hi all.
I've posted a couple of topics on stuff I've done to my boilermate and what was wrong etc. What I'm looking for is info on what it should be doing when it is running normally, so please if you read this, have one, and are familiar with the detail of normal operation please answer and give me some clues.

With all I have done it appears to be working and supplying hot water and heating when required.

What still puzzles/concerns me is that in the last couple of days I have only checked it once and found the boiler pump not running and the actual boiler cool, the rest of the time the pump seems to be running most of the time and the boiler fires up every 20 minutes or so for 1 minute (this would explain why the pump always runs I assume, to stop the boiler overheating with still hot water sitting in it, yes? No?)

With the water set to constant and the heating on timed what should the LED bars indicate when the store is hot and there is no demand on the hot water (or heating) for a number of hours?

I'm hoping Mike the brain might have all the info at his fingertips, as I'm in Scotland I don't imagine he fancies the trip to check it out.

Cheers
Stephen

Stephen

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Post  Stephen on Sat Jun 23, 2018 6:58 am

Developments.

The store gets up to temp but pump keeps running and boiler fires intermittently, unless I switch of the store and turn it on again, the board then clicks back to life with the boiler pump off, where it sits until the hot water demand causes the store to call for more heat, the boiler and pump respond and then just stays on indefinitley.

Any ideas?

Stephen

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Post  onis_uk on Sun Jun 09, 2019 2:24 pm

I have this exact issue, did you ever figure it out?!

onis_uk

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Post  Stephen on Mon Jun 10, 2019 1:45 am

Hi there.

i sort of did. the store was never quite getting up to temp, would hit 76 but never 77, which all came back to the regular but short burn times at the boiler, 40 to 50seconds then off for 20 mins, and repeat.

What I've eventually figured out is this. The heat exchanger at the boiler has some flow restricting sludge/build up on the entry side, this slows the flow rate enough for the water to heat up rapidly beyond the heat exchanger thermistor temp which cuts out about 80. This meant the store water would never quite reach 77, so it was just a never ending cycle.

What I have done is removed that thermistor from it's pocket and left it alongside but outside the heat exchanger, I have placed a thermometer in the pocket that I can read externally to the boiler. The boiler now fires much longer and the thermistor being outside takes longer to hit 80, the heat exchanger itself reaches about 110 before the thermistor cuts it out. But, being a cast iron heat exchanger we reckon it can cope with this for a few years.

All things together, the store now reaches 77 no problem and my gas bill has plummeted.

Stephen

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Post  Stephen on Mon Jun 10, 2019 2:02 am

Sorry, the initial problems came from a failed boiler pump, which I suspect led to the sludge build up at the bottome of the system as any heat transfer to the store was purely by convection.

Stephen

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Post  Mike the Boilerman on Mon Jun 10, 2019 4:38 am

Stephen,

Excellent news, thanks for posting. A failed boiler circulation pump is most unusual. Unfortunate to say, but I suspect somebody accustomed to fixing Boilermates might have noticed this immediately, if actually in front of the boilermate, touching pipes, feeling temperatures, listening/hearing motors running etc and musing about where the problem might lie. On an internet forum we are denied the touchy-feely information and not so easy!!

All the best, Mike

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Mike Bryant AKA Mike the Boilerman, Gledhill repair specialist, webmaster of www.gledhill-repairs.co.uk & www.miketheboilerman.com. For information about my Gledhill repair service or to make a booking call me on 07866 766364. (Please don't phone me for advice if you are fixing a Gledhill yourself, ask on here instead - I run this forum partly to cut down on the phone calls!)

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Post  onis_uk on Mon Jun 10, 2019 10:50 am

I'm I right in thinking that the water inside the BM is sperate to the boiler loop? And sperate again from the DHW?
The LTHW that comes from the boiler goes through a coil in the BM tank and heats that "water store" up?

This stored hot water is then used to heat the cold water via a HE?


Are there any instructions on flushing and cleaning the BM? The water in there must have sat there since install (2007)

Cheers
Onis

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