Nest 3rd gen, Drayton 30002, Drayton LP522

[Deebot]

Hi, hoping someone can point me where I am going wrong.

Replaced the LP522 with the wiring Drayton1:HL4, Drayton3:HL6, Drayton4:HL3 and linked L:2:5. There is a blue wire which fell out I assume 4 when I removed the face, this is connected to HL3.

It seems almost as if the CH and HW are the wrong way around. Sometimes there is a loud buzzing sound coming from a relay somewhere in beside the boiler. Everything is off until I find out what the issue is.

Any advice would be greatly appreciated.

Thanks

 

[CBW]

Sorry, but where does the Nest come into it? Also, what boiler is it?

 

[Deebot]

Sorry, but where does the Nest come into it? Also, what boiler is it?

The boiler is a potterton promax SL

I replaced the Drayton LP522 with the heat link (HL). I can hear the relays clicking on the heat link when I change the heat off or on, same goes for the hot water. The issue is the myson mpe322 stays illuminated even when heat is off. There is a screeching noise comes from something sometimes, probably the mpe322. The boiler seems to come on on its own.

When only heating is turned on, both LEDs illuminate on the mpe322. When only water boost is turned on, both LEDs illuminate on mpe322

 

[ianmcd]

you cant just replace the LP522 with the Nest and leave everything else connected, you will have to link out your existing room thermostat thermostat

 

[Deebot]

you cant just replace the LP522 with the Nest and leave everything else connected, you will have to link out your existing room thermostat thermostat

Thanks, how would I do that?

I had read I could just leave it set to maximum so that it doesn't interfere

I have found that the mpe322 is faulty and I think there is in fact nothing wrong with the nest installation I had done.

 

[ianmcd]

I had read I could just leave it set to maximum so that it doesn't interfere

if you are happy to leave it in place , simply put the two switching wires into the same terminal