The Efficient Home Forum

HI All,

I have an S-Plan configuration with a motorised valve for the hot water and another for the heating. Everything seems to work fine, except, when I turn hot water only, it switches on the heating motorised valve as well. If I turn on the hot water manually (i.e. push button on BDR91) it does not turn on the heating.

The boiler BDR is added as a Wireless Relay Box and hot water is configured as 2 zone valve.

The BDR91s are 70cm apart and both are about the same distance from the boiler.

Any suggestions as to why the heating mortised valve comes on with the water? I have unbound and rebound both devices but still same issue.

Is the bdr configured for s plan?

rodgeeroo - I had a similar thing on my recently self-installed Evohome system.
It may be that the Heating BDR91 is 'double-bound' to the DHW BDR91. This is easy to do if you bind the heating first and then bind the DHW using the guided set-up and inadvertantly bind it again - as I did.
I un-binded (unbound?) both BDRs and used the guided set-up. Bind the DHW first and at the end of this procedure it asks you (from memory) to bind the heating zone valve (I think). You can bind the heating BDR at this stage safe in the knowledge that the heating BDR is in its unbound state and will not be inadvertantly double bound.
This fixed it for me.

rodgeyroo wrote:HI All,

I have an S-Plan configuration with a motorised valve for the hot water and another for the heating. Everything seems to work fine, except, when I turn hot water only, it switches on the heating motorised valve as well. If I turn on the hot water manually (i.e. push button on BDR91) it does not turn on the heating.

The boiler BDR is added as a Wireless Relay Box and hot water is configured as 2 zone valve.

The BDR91s are 70cm apart and both are about the same distance from the boiler.

Any suggestions as to why the heating mortised valve comes on with the water? I have unbound and rebound both devices but still same issue.

You've not bound them correctly... You need to ensure you don't have anything under 'boiler control' and bind the devices via the hot water guided configuration option.

Excellent.. I had this issue and I had bound them independently.. all sorted now thank you everyone.
I'd bound the heating valve as a stand alone rather than through the guide for hot water..

Could this have caused the boiler to putting the heating on at all times of the day and night even though I'd not set it to come on ?

I'll keep an eye on it but for a little while (not sure how long I'd had that previous setting) I've been noticing the boiler kicking in at odd times during the night and I may well have missed a load during the days while out or working too!!

Hi all - I wanted to post this as I was having similar issues on this. I have an S-plan with 2 valves - one for DHW and for CH. When calling for DHW or CH, BOTH relays would trigger. I find the guide configuration guide didn't work too well, so I added the DHW (stored water) first as a manual entry and CH next (appliance) . Before I committed to switching over the from the old programmer I was able to test, by changing values for DHW so it would come on and setting a room with a higher temp. The relays I have are not the same. The DHW has the normal smooth front but the CH has a raised bevel edge. Under the hood I guess they are the same. So if you are having issues, stick with it. One other thing make sure you factory reset the relays by holding the button for 15 seconds. This makes a difference. Good luck!