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Right, so got this sorted now. CH and W work fine now. Today, when I measured the voltage on mid position valve wires. I noticed that it was not seated properly/fully on the actual valve itself. So I got it on properly and CH is working!!!!!! Thanks for your help and sorry to waste your time...

At the Drayton side, the black wire (1 HW off) is connected to a grey wire that goes to mid position valve and thermostat black wire. the Grey wire (3 CH on) is connected to the hot water tank thermostat brown wire. Brown wire (4 on) is connected to mid position white wire.

i've got the m well it is not drayton as got the old thermostat and controller wired on and same results, hot water works but no CH where do i start with a multimeter? Help, please.

thanks

Got the old control box and ald thermostat wired back on today. Exactly the same results. I can put hot water on but can't put CH on. I guess it is time for a multimeter! Another thought, I'm aware of the requirement to have the pump on for a while after the CH or H is switched off. Just to...

Yes, this is the case, the mid position valve :) orange cable is connected to Demand input (LR)/ switched live cable.

the task for tomorrow is to rewire it to the old thermostat and control unit.

less than 10£ should be able to afford it. https://www.screwfix.com/p/lap-ac-dc-digital-multimeter-600v/75337

haha, I don't have a multimeter! But will consider getting it! ideally, this should be tested at the boiler black wire? what voltage is expected??

yes i do have it. https://www.diynot.com/diy/threads/ep200-and-rts1-replaced-by-wiser-2-channel-wiring-question.513798/#post-4270666

I'm thinking if this is a faulty drayton wiser unit. The only way I could prove this is to re-wire the system to my old thermostat and Salus EP200 controller unit.

The model number is WT724R the two-channel. Is there a separate wiring centre - Yes, see the pictures posted.

OK, i see the orange wire coming from the port valve. It is joined with a couple of brown wires and blu wire. Blue and orange go to pump and the last brown goes back to Drayton wiser box.

I had some issues with the installer, wouldn't want to speak with him.

Apologies for the late reply The brown wire goes to the upstairs cupboard and is connected with the red one. Then the red one goes to the downstairs old thermostat box and it is joined with the yellow wire ( because I replaced the old thermostat with wireless Drayton Wiser, link to the forum...

ok, that makes sense now, let me track the cable down and will let you know.

Hi All, Basically got a new boiler installed about 4 months ago and thought all was fine. At the installation point, I tested the hot water functionality but don't remember to test heating at all. Today I finally tested heating and although Drayton Wiser heating light gets on, the boiler...

Hi all, Finally I got my smart thermostat (drayton Wiser) installed. It took me a bit time but with help of this forum we got it working :) So, phase two is to replace my existing TRV's with wiser...

thank you for replay, i will create new thread asap have a good day

Quick update, all works fine now. it was the red and yellow cable. Brilliant im happy with this. now i wonder if i could bother you again, i think with your experience it will take no time to give me you opinion. So, phase two is to replace my existing TRV's with wiser one's. My valves are...