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Dreaded Boilermate 2000

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Scott M

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Hi,
I have a Gledhill Boilermate 2000 system installed in my house which seems to have a fault. The local plumber that I have looking at it is wanting to replace the whole system which I am not sure is necessary. He has suggested that I contact Gledhill Technical support but at £1.50 per minute to speak to them I would rather not! I was hoping someone here could could suggest a possible cause of the issues so that I can point him in the right direction.

The heating is working fine, the issue is with the hot water. There are 2 showers and a bath in the property and the hot water from all of them turns cold briefly regularly during use.

With the shower running what is happening is the DHW pump in the Boilermate 2000 is turning off briefly every couple of minutes (or less). With the front panel off of the Boilermate 2000 I can hear the pump turn off, the LED bar 3 on the display turns off briefly (a few seconds) then the pump starts again. That bar on the LED display indicates if the pump is running or not.

Pressing SW2 on the control board so the display show the DHW Outlet temperature, it rises up to between 50-55 degrees, the pump stops, temperature drops and then the pump starts and temperature rises again. Occasionally what happens is the display reads around 52 degrees, the pump stops and the temperature on the display jumps to 85 degrees and then immediately back down to 52 and drops before the pump starts again.

There are occasionally times where it just works normally, when it does then the temperature of the DHW outlet is a steady 54 degrees and the pump keeps running.

Can you offer any suggestions as the where the problem is ie Faulty control board, pump, temperature sensor or heat exchanger?

Thanks in advance!
 
I think the problem was he didn't want me to have the expense of replacing parts randomly without knowing what part was faulty. Apparently it could be a number of things.
 
Scott M said:
Better plumber it is!
Click to expand...
Honestly mate...Fault finding is my thing! I can tell you I have absolutely no idea about boiler mates, but if I came to look at yours it would be fixed in 2 visits.
It’s knowing what to test, how to test it, reading and understanding the manual and speaking to manufacturer.
Of course once you identify what your fault actually is you need to work out if it’s financially worth while to fix.
Good luck my friend :)
 
dan_the_plumber said:
Honestly mate...Fault finding is my thing! I can tell you I have absolutely no idea about boiler mates, but if I came to look at yours it would be fixed in 2 visits.
It’s knowing what to test, how to test it, reading and understanding the manual and speaking to manufacturer.
Of course once you identify what your fault actually is you need to work out if it’s financially worth while to fix.
Good luck my friend :)
Click to expand...
Just remember to turn off the 2nd live if it has one.;);)
 
dan_the_plumber said:
No seriously in this case my guess would be limescale in the DHW heat ex/coil....If that’s the case rip it out and start again would be best :)
Click to expand...
I spoke to someone who seems to know a lot about this model. His thinking is if the temperature at the heat exchanger is occasionally saying 85 degrees which is not possible if the max temp of the store is 70 then it may be a faulty thermistor on the heat exchanger. It is only 20 quid and easy to replace so will give it a go and then maybe swap the heat exchanger or the main board if it doesn't fix it.
If it is reading 85 degrees then the controller would shut off the pump to let it cool down. Sounds plausible...
 
Scott M said:
I spoke to someone who seems to know a lot about this model. His thinking is if the temperature at the heat exchanger is occasionally saying 85 degrees which is not possible if the max temp of the store is 70 then it may be a faulty thermistor on the heat exchanger. It is only 20 quid and easy to replace so will give it a go and then maybe swap the heat exchanger or the main board if it doesn't fix it.
If it is reading 85 degrees then the controller would shut off the pump to let it cool down. Sounds plausible...
Click to expand...
Tell him to change both.

Edit as this should have said both sensors. It sounded like I meant all parts mentioned, but I didn’t.
 
Last edited:
if you're getting a good flow out the hot taps the plate aint scaled. if as you said you follow the logic diagram using sw1 and sw2 you can bring up the hot water flow temp as the thermistor is reading it. if you, re getting intermittant 85c readout its more than likely a thermistor fault which is common on boilermates. changed loads of these
 
@garygvl so you wouldn’t do both together whist on site ? You would charge the customer another call out when the other one goes?

I’m talking about both sensor by the way not the heat exchanger. My first post sounds confusing. My bad. I deserve the dislike for not explaining.
 
Harvest Fields said:
@garygvl so you wouldn’t do both together whist on site ? You would charge the customer another call out when the other one goes?
Click to expand...
asked the question do you have a good flow rate from hot taps. if you have wouldnt change the plate. from previous on these use the readouts when running the hot tap its more than likely the thm. why would i charge them for a plate thats not needed. if i was stood in front of it i would know
 
garygvl said:
asked the question do you have a good flow rate from hot taps. if you have wouldnt change the plate. from previous on these use the readouts when running the hot tap its more than likely the thm. why would i charge them for a plate thats not needed. if i was stood in front of it i would know
Click to expand...
I didn’t mean the plate mate. I meant both sensors.
 
Harvest Fields said:
The PHE and DHW sensors. Have always done them together.

I’m not. The OP said for £20.00 a thermista he was going to get it changed. I didn’t suggest changing it at all. All I said was I would do the DHW and PHE sensor at the same time if you are doing the one.
Click to expand...
phe and dhw are both the same sensor so you could just buy one and watch the sensor readouts to determine which one is faulty. never had to change two before
 
garygvl said:
nowt wrong with a bit of belt and braces just never believed in changin parts for parts sake
Click to expand...
Fully agree. If I am honest it is only because we had a massive estate in Telford that had 100s of them when I was on the books with a company and that is what they requested we did. The main problem we had was with these sensors. Just think it was a piece of mind thing for them and it has stuck with me.
 
Harvest Fields said:
The PHE and DHW sensors. Have always done them together.

I’m not. The OP said for £20.00 a thermista he was going to get it changed. I didn’t suggest changing it at all. All I said was I would do the DHW and PHE sensor at the same time if you are doing the one.
Click to expand...
Yeah I’d change both, might as well for £15 or £20. Sounds like customer has pretty much had enough already :)
 
There are two big estates round my neck of the woods fitted with boiler mates, Around 250 of them in total. 8 times out of 10 it is the sensor which we find at fault. We also swap them both out at the same time and we change them routinely on its 5 year service as experience has taught us that they don't last much longer. We explain it to the customer as like changing their spark plugs on a car. They may still work ok for now but almost certainly are not performing at there best and may fail at any time. the next most common thing is the pump head needs changing. Also never had to change out the plate they are quite good with decent ports and good flow through and very rarely scale up. but I am in Yorkshire with lovey soft Dales filtered water so scale is hardly ever a problem around here.
 
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