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  1. #14
    Join Date
    Jun 2011
    Location
    Seattle WA
    Posts
    1,223
    The jumper is on FFuel. The control won't let you screw it up since it recognizes all model numbers connected to the system. I have not double checked the sensor yet but it is still reading outside temp at the thermostat.
    America; first we fight for our freedom,
    then we make laws to take it away.

    -Alfred E Newman

  2. #15
    Join Date
    Jun 2011
    Location
    Seattle WA
    Posts
    1,223
    Quote Originally Posted by rundawg View Post
    As beenthere said, it sounds like the control is not recognizing the FFUEL jumper in the ON position.

    The HP to FURN transition in FFUEL operation is only allowed to occur if there is a call for auxiliary heat (W).

    The FFUEL jumper is what tells the control to energize W, when Y1 or Y2 is called for below the Balance Point.

    The heat pump will run exclusively below balance point if there is NO call for auxiliary heat (W).


    Just something to keep in mind:

    The control only reads the jumper inputs when the Y1, Y2, and W thermostat inputs are de-energized. So if a jumper position is changed while any of these inputs are energized, the control will not act upon the jumper changes until all three of these thermostat calls are de-energized or power (24 VAC) to the control is cycled.

    I think I would also double check to see if the ambient sensor is securely attached to the control board.
    The damn Comm control is more trouble than its worth and has proven itself so on multiple occasions, I bet the fix will be several trips out and calls to tech support only to get rid of that stupid control and put a Honeywell in there
    America; first we fight for our freedom,
    then we make laws to take it away.

    -Alfred E Newman

  3. #16
    Join Date
    Oct 2001
    Location
    Vancouver Island BC Canada
    Posts
    142
    What did you find ...anymore head way? I am a york dealer as well. I feel your pain. I had a problem with these comm stats as well, however my system when set in auto.. heat 70 cool 74. whenever coming of night time set back the house would warm to 70 then it would switch into ac and start cooling. I did a hard default reset on the set . reloaded and all was good. You may want to try that

  4. #17
    Join Date
    Oct 2001
    Location
    Vancouver Island BC Canada
    Posts
    142
    What did you find ...anymore head way? I am a york dealer as well. I feel your pain. I had a problem with these comm stats as well, however my system when set in auto.. heat 70 cool 74. whenever coming of night time set back the house would warm to 70 then it would switch into ac and start cooling. I did a hard default reset on the stat . reloaded and all was good. You may want to try that

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