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  1. M

    Honeywell ST699 to ST9400C

    Just another update, I REALLY SHOULD READ THE INSTRUCTIONS! i hadn’t copied the on/off times to the different days so it was running on the factory presets. Again, thanks for the help.
  2. M

    Honeywell ST699 to ST9400C

    Ok, having taken off the faceplate to take a photo of the current wiring, it all seems to be working ok now. Fingers crossed it stays that way, if not, I’ll be back! Thank you for the help.
  3. M

    Honeywell ST699 to ST9400C

    Thank you for response. Unfortunately not. Is there another way to test? Following the Honeywell replacement wiring diagram it shows the green/yellow wire from 7 to 1. Is there a reason why it should be in 2?
  4. M

    Honeywell ST699 to ST9400C

    Sorry, here you go.
  5. M

    Honeywell ST699 to ST9400C

    Hi, I decided to replace my old ST699 programmer with a ST9400c. I followed the attached diagram but I have no CH off wire. The CH now runs constantly even on the timer. Any ideas Please?
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