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    Identify electric underfloor heating controller

    Hi sorry I wasn’t sure if to post here or in electrics. Hope someone can help identify this controller. Also can I just swap to a newer one if required ?
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    S plan with HW OFF?

    Hi I would like to replace my ST9400 and remote thermostat with a T6R-HW. As far as I can tell I have an s plan system (I.e. it seems to have two valves) but in the st9400 controller I see that the pin 1 hw off is connected but all the diagrams I can find only have hw off on a y plan. Can anyone...
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    Upgrade Honeywell ST9400 to T6R-HW

    Hi Hope someone can point me in the right direction. I have a Honeywell ST9400 with remote thermostat. The ST9400 is in the airing cupboard whilst the thermostat wireless receiver is in the loft next to the boiler. When I replace these units with the T6R should I 1) replace the ST9400 with the...
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