Drayton Wiser Kit 2 controller not calling for heat in CH mode

[Miguel Ortiz]

Hi,
I have recently installed a Drayton Wiser Kit 2 to replace an old Potterton EP2001 with an oil fired boiler (Grant Euroflame). I’ve wired the Wider with the same wiring setup as the Potterton, expect without the link wire from L to 5 (as someone helped me with on this forum). The HW is working fine, but when the systems calls for CH, the radiator valves open but the boiler doesn’t kick in. So, if the HW is on at the same time, the radiators heat up, but if it’s not, then the CH doesn’t heat.
I wonder whether I’ve got a loose connection somewhere, but have looked and it all seems to be wired ok. Any help much appreciated.
Thanks
Miguel

 

[sxturbo]

Is it y plan or s plan?

 

[CBW]

Did you link out the old thermostat or set to maximum?

 

[Miguel Ortiz]

Thanks sxturbo and CBW. There isn’t a thermostat anywhere so I assume it was set up to run the CH for as long as the timer was on. As for Y vs S plan, I’m not sure I’m afraid. The only valve I can see is this one below the HW tank. Not sure if you can tell from that.

 

[CBW]

The only valve I can see is this one below the HW tank. Not sure if you can tell from that.

That’s a pump and gate valve. It could be a gravity system. You’d be looking for something similar to this if you have any zoned control: Honeywell

 

[Miguel Ortiz]

Yes, I’m pretty sure it’s a gravity system.

 

[ianmcd]

Yes, I’m pretty sure it’s a gravity system.

Wiser can not be used with a gravity hot water system, you will need a different system, when you had the EP could you get CH without HW also selected, if you could you dont have a gravity HW system, if thw HW automatically switched on when you selected CH then you do indeed have a Gravity HW system and the wiser cant be used for this

 

[Miguel Ortiz]

Ok, thanks. I guess that’s my answer. Do you know if there are any other wireless systems that can work with a gravity system?

 

[CBW]

I’m guessing it’s a case of researching what you want, but I believe Hive does.

 

[Miguel Ortiz]

And, sorry, one more question - what was my Potterton EP2001 doing then? It seemed to turn on the boiler when the CH turned on.

 

[ianmcd]

And, sorry, one more question - what was my Potterton EP2001 doing then? It seemed to turn on the boiler when the CH turned on.

Hive dual channel or nest can both be set to gravity HW as can some others, basically with gravity HW the boiler is powered when HW is selected, the water circulates via Gravity and heats the cylinder, when CH is selected the HW part brings the boiler on, the CH part powers the pump, hence why you cant have CH without HW , if you look on the back of the old EP you will see if Fully pumped or gravity was selected

 

[Miguel Ortiz]

Thanks everyone. Very helpful, even if it’s bot the answer I was looking for. Saved a lot of faffing about trying to work out why it wasn’t working. Drayton onto eBay and I’ll give the Hive a go.

 

[ianmcd]

Thanks everyone. Very helpful, even if it’s bot the answer I was looking for. Saved a lot of faffing about trying to work out why it wasn’t working. Drayton onto eBay and I’ll give the Hive a go.

If going for hive make sure it is the dual channel and you have to set it to gravity HW