Unable to control Electric Heat Switch without firing up heating

[Bob_Pyrford]

Our current Wiser configuration is:

  Channel 1 - regular radiator central heating

  Channel 2 - Hot water

  Channel 3 - single zone wet underfloor heating in 'Garden Room'

This configuration has worked well for the last year.

We're re-fitting both bathrooms at the moment and are installing electric underfloor heating in each room. For this, we're using the Wiser Electric Heat Switch, floor sensor, and Wiser Room Stat. However, the room stat requires to be assigned to either zone 1 or zone 3 and, as a result, fires up the respective heating channel whenever the bathroom room stat or schedule decides the electric underfloor heating should turn on. It turns on the associated heating channel irrespective of whether any of the other heat demand devices for channels 1 or 3 are asking for heat, and therefore heats up other parts of the house. I have the bathroom room stat assigned to channel 3, so at least it's only triggering the Garden Room underfloor heating rather than the central heating, but it's not ideal.

in all other rooms, controlled by either rad stat or room stat, the app allows re-selection of the channel and offers "None" as an option, as well as Chan 1 or Chan 3 (see screenshot). On the bathroom controlled by the heat switch and room stat, it doesn't show the current channel, and it was only on initial adding of the room stat where this option was shown (and only offered Chan 1 or Chan 3, not "None"). This seems a strange inconsistency. I'm guessing that if it were possible to select "None", either on initial configuration or subsequently, that this might resolve my issue.

What I'd like to be able to do is to have the room stat and/or schedule only turn on the associated electric heat switch, without being associated with either channel 1 or 3.

Has anyone else come across this issue and/or know a solution?