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oops, quite right, serves me right for just trying to use what I had, without actually thinking about it! Thanks, sorry for the waste of time...

Hi all... Having just moved in I want to replace the standard Thermostate (the RMT230) with the Honeywell ST9400C as I already have a new unused ST9400C. I've searched around to try and confirm the wiring of the ST9400C, but not being in the trade I am not sure, so hope that you good...