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Discuss Honeywell wireless not binding!!! in the Central Heating Forum area at

  1. Marty28k

    Marty28k Guest

    Hi, at the best time of the year, I discover that my honeywell st9420c has lost its wireless connection with the room stat and now will not 'bind' with the unit. Following the instructions both units correctly go into the binding mode but it never compleates successfully! Anyone with know or similar experience please advise, Thanks
  2. mountainman

    mountainman Plumber GSR

    I hate wireless controls.

    Have you put new batteries in the sender unit?
  3. Marty28k

    Marty28k Guest

    Yes, new batteries, units are next to each other so its not a distance thing, I'm beginning to dislike too, but its only about 16months old!!!!
  4. mountainman

    mountainman Plumber GSR

    A new unit is required methinks.
  5. Dan Masey

    Dan Masey GSR

    yep i had this mate with mine, i contacted honeywell directly, they sent me an email of a step by step guide which they do not put in the user guide or manuals online.

    here it is.



    Ensure the slider is in RUN

    Press and hold +, - and Heating mode buttons for 8 seconds

    BIND MENU will show briefly, followed by first binding display

    Use + and to select the Radiator symbol, Press OK

    If display shows -- -- - - nothing bound
    If display shows bnd something already bound

    (If you want to cancel existing binding press OK for 8 seconds and the display will say RESET for a few seconds), then

    Press OK to put in binding mode, display will flash BINDING ready to receive, ---- will flash


    Hold DT92E approximately 1 metre from ST9420C
    Press and hold the power button for 2 seconds
    Hold the and for 3 seconds until Inst is displayed
    Press and the display shows Cont
    Pressing the 3 times and the display shows CLr
    (Press the power button until --- if you want to clear existing binding data)
    To put into binding mode press the display will show Cont
    Press power button to send binding message display will show Sync up to
    4 minutes

    If binding has been successful bnd will be shown on the ST9420C and display will show COMPLETE for a few seconds and bnd will stop flashing

    If the binding was unsuccessful the ST9420C will show ---- flashing

    To exit binding mode put slider to RUN on the ST9420C.
  6. mountainman

    mountainman Plumber GSR

    Jeez, I'd run a cable and fit a wired 'stat.
    • Like Like x 2
  7. happyflyer

    happyflyer Guest

    You mean in the time it takes to bind???
  8. Marty28k

    Marty28k Guest

    Thanks Dan, these are the instructions I followed. It just never actually successfully binds. Just continues to flash as if both units are still looking for each other, ending up timing out after 10 mins or so. I have been over it so many times, they must be a fault but in the controller or the room stat, who knows?
  9. lame plumber

    lame plumber Guest

    change the frequency settings, could be a new computer wireless unit interfering,
  10. happyflyer

    happyflyer Guest


    How many different channel are there on these units.
  11. Marty28k

    Marty28k Guest

    Lame, how do I change the frequency settings?
  12. happyflyer

    happyflyer Guest

    Yes Lame can't see it in the destructions
  13. happyflyer

    happyflyer Guest

    You mean on the computer???
  14. PETE 123

    PETE 123 Active Member

    Had something like this in the end i took prog off plate waited 5secs and replaced back on wall plate and it worked
  15. lame plumber

    lame plumber Guest

    most rf units have dip switches to allow you to change the freqency used,
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