LP522 programmer and water heater always on

[Domenico]

Good morning everyone
I am facing a problem with the hot water/heating programmer Drayton (LP522): although there are two different programs for the CH and the HW, the latter is always on.

In other words, when the heating system is on the water heater receives the hot water coming from radiators.
When the heating system is off, the water heater is making hot water using the internal electrical resistence.

Also, I tried to turn off the water heater through the programmer, but it is still on: the only way to stop it is switching off the electricity from the programmer.

From the experience gained in this case, I can assume that the programmer is not able to manage HW and Ch independently. However I don't know whether:
1) the programmer works in that way (in this case I need to upgrade it)
2) there is a wiring problem behind the programmer.

I am sorry for the long message, and I thank your for your answers in advance.

 

[ShaunCorbs]

Could be a port valve issue best to test the components first

 

[Riley]

Bit confused with the electrical resistance bit. Is your immersion heater on permanently too? Inclined to agree with @ShaunCorbs though

 

[Domenico]

Bit confused with the electrical resistance bit. Is your immersion heater on permanently too? Inclined to agree with @ShaunCorbs though

I am sorry for confusing with the lack of technical lexicon. The immersion heater is on only when the heating system (gas boiler) is off, and viceversa.

 

[Murdoch]

The immersion should only be on when it's switched on ... It's totally separate to the heating

 

[Riley]

The immersion heater is a back up

 

[Domenico]

The immersion should only be on when it's switched on . It's totally separate to the heating

I found this plot. The model is the Megaflow CL125

 

[Riley]

So is the immersion heater heating the water when the call for hot water from the programmer is off??

 

[Murdoch]

^^ that doesn't show the backup electric immersion

 

[Riley]

I can’t work out if this is a fault or confusion

 

[Domenico]

So is the immersion heater heating the water when the call for hot water from the programmer is off??

Definitely not. The immersion heater is off only when the boiler is on.

 

[Domenico]

Thanks for all your answers. Later I will buy a multimeter, and I will try to check what is going on.

 

[Murdoch]

Thanks for all your answers. Later I will buy a multimeter, and I will try to check what is going on.

Do you have any idea what you are looking for?

 

[Domenico]

Do you have any idea what you are looking for?

At least, I would check whether the programmer works or not. If it is ok, I will just call a technician

 

[Riley]

Do you know what an immersion heater is?