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440Cdi, replace comfort programmer with nest

Discussion in 'Plumbing and Central Heating' started by Muzz, 17 Aug 2021.

  1. Muzz

    Muzz

    Joined:
    22 Jan 2009
    Messages:
    203
    Thanks Received:
    8
    Location:
    Aberdeenshire
    Country:
    United Kingdom
    Hi,

    Just moved into a house with 5 or so year old 440Cdi with a Comfort dual channel programmer but no thermostat.

    I would like to add a nest thermostat and understand the wiring requirements, but wonder if someone can clarify what to do with the old programmer.

    I assumed it should be disconnected as the nest takes over heating control and it's not needed for hot water?

    As it's uses built in contacts rather than a ribbon cable I can't just disconnect it and removing it would leave a gap that would need a blanking panel re-fitted?

    So to summarise:

    Do I fully disconnect the comfort programmer?
    Can you buy a replacement blanking panel if I remove it?

    Thanks in advance.
     
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  3. Muzz

    Muzz

    Joined:
    22 Jan 2009
    Messages:
    203
    Thanks Received:
    8
    Location:
    Aberdeenshire
    Country:
    United Kingdom
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