Dreaded Boilermate 2000

[Scott M]

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!

 

[SimonG]

Gledhill tech support.

 

[townfanjon]

Sorry not what you want to hear ...
Horrible things . Sorry.

 

[Scott M]

Thanks anyway, worth a shot!

 

[dan_the_plumber]

TBH...If the plumber can’t fault find on his own , without asking you to phone tech support on his behalf...You need to get a better plumber!

 

[Scott M]

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.

 

[dan_the_plumber]

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.

Only if he doesn’t know how to test it though

 

[Scott M]

Better plumber it is!

 

[dan_the_plumber]

Better plumber it is!

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

 

[Harvest Fields]

You need an engineer that has worked on gledhill before mate. Google it. There should be some out there somewhere.

 

[Harvest Fields]

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

Just remember to turn off the 2nd live if it has one.

 

[Scott M]

Thanks for the advice.

 

[townfanjon]

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.

Lol , erm thats quite a statement Dan.

 

[Harvest Fields]

Lol , erm thats quite a statement Dan.

I didn’t want to say anything

 

[dan_the_plumber]

I’m quite a plumber! Lol

 

[dan_the_plumber]

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

 

[Riley]

Lol , erm thats quite a statement Dan.

Wow bold

 

[Scott M]

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

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...

 

[Harvest Fields]

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...

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.

 

[dan_the_plumber]

For the cost of thermistors it’s worth a bash I’d say

 

[garygvl]

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

 

[Harvest Fields]

@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.

 

[garygvl]

@garygvl so you wouldn’t do both together whist on site ? You would charge the customer another call out when the other one goes?

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

 

[Harvest Fields]

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

I didn’t mean the plate mate. I meant both sensors.

 

[garygvl]

I didn’t mean the plate mate. I meant both sensors.

why you changing two sensors