Drayton Wiser + Worcester Ri 24 issue with heating but i can get hot water on.

[Bart1999]

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 doesn't start. Same time I can switch the hot water on using the app with no problem. So what am I missing here?

The wiring looks ok to me at the drayton and boiler point. The installer didn't mess about wires at the Drayton point at all. And the fact that the black cable can call for hot water means the cable is good. Also, drayton wiring worked fine on the old boiler too.

the port valve works correct too, it changes position when hot water and heating is switched on.

Could it be a faulty Drayton unit? If so I should be able to test this with a multimeter.

Any ideas?

Regards
Bart

 

[martygturner]

Which model wiser is it ? this may be of some help...terminal 4 does the ch but is there a separate wiring centre ?The black wire seems to be going direct from the HW on the wiser to the demand ( LR on St2) on the boiler, meaning that unless there is a wiring center there is no demand for CH being called, ie where is the brown wire on the CH on going ?

https://www.draytoncontrols.co.uk/sites/default/files/6490238_N_A4_Web-compressed.pdf

 

[CBW]

What black cable? If you mean the black wire, that is being used for hot water off, your heating on is the brown wire in terminal 4.

 

[CBW]

what is the boiler ?

Worcester ri 24 as per thread title

 

[Bart1999]

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

 

[ianmcd]

The black wire connected at the boiler should come from the orange wire on the mid-position valve

 

[terryplumb]

Why haven't you called the installer back ??

 

[CBW]

Why haven't you called the installer back ??

I wondered that, but then OP states boiler installer didn’t touch the wiser wiring. However it worked previously.

 

[Bart1999]

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 post) . Then the yellow one goes back to the upstairs cupboard and is connected to the white wire. This wire goes to the port valve. So I'm lost a bit at this stage.

Old thermostat box

Upstairs cupboard

 

[Bart1999]

I wondered that, but then OP states boiler installer didn’t touch the wiser wiring. However it worked previously.

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

 

[Bart1999]

The black wire connected at the boiler should come from the orange wire on the mid-position valve

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.

 

[Bart1999]

Which model wiser is it ? this may be of some help...terminal 4 does the ch but is there a separate wiring centre ?The black wire seems to be going direct from the HW on the wiser to the demand ( LR on St2) on the boiler, meaning that unless there is a wiring center there is no demand for CH being called, ie where is the brown wire on the CH on going ?

https://www.draytoncontrols.co.uk/sites/default/files/6490238_N_A4_Web-compressed.pdf

The model number is WT724R the two-channel.


Is there a separate wiring centre - Yes, see the pictures posted.

 

[CBW]

I think it could be your joining of the red and yellow wires from the old thermostat. Do you have a photo of how that thermostat was wired up?

 

[Bart1999]

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.

 

[CBW]

You could test for voltages.