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  1. G

    Honeywell st9400c to Drayto Wiser

    Thanks. It will clip on to the backplate but I'm not sure the current wiring is correct for the new programmer.
  2. G

    Honeywell st9400c to Drayto Wiser

    Hi. I have a Honeywell programmer with remote CH thermostat (oil boiler and hot water cylinder). I want to replace with a Drayton wiser 2 kit. The wiring is shown in photo. Do I need to change it?
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