no hot water, but heating ok

Hi I'm not sure if I have a 9kw or 12kw, but lately i've noticed the hot water hasn't been as responsive as it used to be. This got worse the last few days and today there is no sign of any hot water, despite the central heating working fine.

I had a look at the manual (untrained) and from what I can see the indicator for BAR 3 - HW ON is not coming on when the hot water tap is running, and the pump is not coming on either (although it does when I turn the central heating on). Consequently none of the LED lights come on when the hot water tap is running (tried several taps), but light 3 for heating pump comes on when central heating is activated.

During my last service (less than a month ago) I was also told the pump has an A/C regulator which controls the amount of hot water supplied, and that it does not always work well and a solution is to skip the regulator and have a constant supply.

Would appreciate any advice! This is all new to me! Thank you!

Hi as you are unsure which unit you have.
I will assume it is the EM2000.
It sounds like a sensor problem. DHW and or PHE sensor.
Skipping the regulator does not sound good.
The sensors and the pump are what control the flow of water through the PHE to keep the temp around 50 t0 55 c.
Mike
MGC/H2O
Norfolk

Hi Mike thank you for your prompt reply, this forum and yourself are incredibly helpful!
Yes it is the EM2000. From what I can see the sensors should cost about £30?

Yes approx £30:00p each.
Plus fitting.
Mike
MGC/H2O
Norfolk

Hi Mike, turns out it wasn't a sensor!
It was the pump which "seized up". The pump is now manually set to constantly run, which I assume is like what was mentioned earlier about "skipping the regulator". This suggests I now need a new pump, which is apparently very common? As they're not designed to start up "slow" and sometimes don't start at all?
I was reading through your article on frequent problems, and this doesn't seem to come up.
Running the pump constantly would not require a new pump, but I'm just thinking about the energy I'm wasting!
Thanks again Mike!

Yes I do not agree with running it like that.
Wear on the pump.
Energy wasted.
Mike
MGC/H2O
Norfolk