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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.
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
 
nowt wrong with a bit of belt and braces just never believed in changin parts for parts sake
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.
 
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.
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.
 
I had one of these in my own house and the house of my father in/law. Since have both been changed to a worcester 30si compact and a worcester 30RI heat only with a unvented cylinder. Price may seem costly but my it is worth the expense as gledhills are simply a pain in the arse!
 
I put my money on the board being at fault we replace Adair few on the states round where I live. Barring the odd pump going it’s the only thing we replace on them. But again I would 99 percent say it will be the board they are rubbish
 
I have exactly the same problem. I wondered if you ever got resolution?
Yes I did, and fixed it. In my case it was a Thermistor on the heat exchanger that was faulty.

You can see if yours is faulty by checking the temp for the HW on the LED display when the water is running. Mine was jumping up to around 85 degrees and causing the pump to shut off temporarily and then going back to 60 degrees. 85 degrees should not be not possible.

This is a link to the repalcement Thermmistor:

Shut of the mains water, turn of the power to it, bit of PTFE round the thread and it was done.
BM2000.PNG
 
I have exactly the same problem. I wondered if you ever got resolution?
To see the HW temp, press SW2 Three times and the display will read HXX (xx it the temp)

SW2 is the second swich down below the LED display.

It is also possible that your main board is faulty, sensor is cheap to replace first though.
 

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