Evo home boiler relay faut

Hi Darren,

I am also suffering comms faults, but I believe mine is down to distance from the controller and possibly the construction of the house (lots of solid walls and several steel beams).

Upon first installation we also had issues with comms faults to the boiler, so we moved the location of the relays closer to the controller by extending the wiring considerably. Obviously this solution isnt for everyone, but it fixed out issues with comms faults to the relays for us at least.

Im currently trying a variety of possible fixes - my 868mhz repeater should arrive today or Monday.

Ive noticed that the orientation of the controller also seems to play a part in the strength of communication - the front or rear is directly facing toward the relay, you may find this improves it. If my controller is at an angle to a particular zone, it does lose communication from time to time. This may also be the case with the relays.

A plan layout may help.

You can have a read of my thread discussing communication/range issues here:



Again, Im amazed that Honeywell dont make a simple plug in range extender. The system is just crying out for one.

How did you originally configure the system? Being an S plan setup, you have 2 motorised valves, one for HW loop the other for Central Heating?? Try this...

1) Perform full Factory Reset
2) Choose 'Guided Setup'
3) Select 'No' to require a Boiler Relay/Heat Demand Relay
4) Select 'Yes' to Hot Water Kit
i) Bind CS92
ii) Bind DHW BDR91
iii) Bind CH BDR91
5) Create Zones
6) Have some cake

If choosing 'Yes' to the Boiler Relay, then it will effectively double-bind the Central Heating loop BDR91, which at first will cause the hot water event to also open the Central heating valve, however, it will be plagued with comms fault, as it will be fighting itself and get confused.

Thanks for your time guys

If I select no to require a boiler relay what will tell the underfloor heating zone valve to open so it can flow to my manifold?

Currently I have

Two port on hot water
Two port to underfloor heating manifold
Hr92 on radiators upstairs which act as the zone valves and obviously no two port on this loop

What would be the correct order to install these to the evohome?

Thanks

Darren