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Honeywell emm-3 goes to high heat when thermostat does not call for heat

Have a Trane furnace, will suddenly turn on when thermostat does not call for heat. The honeywell emm-3 electronic mini zone shows red light on, indicating heat is on. Goes to full high call for heat and will run exceeding the setting on thermostat. Example we have it set to 69 and tonight we came home to furnace running on high and temp in house at 73

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  • Master
  • 613 Answers

Replace it (thermostat), but first make sure its in a good location to read the space temperature.

Posted on Dec 14, 2013

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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tborn6
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SOURCE: Honeywell T87f 3855 Doesn't Activate Heater

thats becaue you need more than this zone working like you said about the master/slave this zone is a slave.

Posted on Jan 25, 2009

  • 61 Answers

SOURCE: thermostat issue with comfort zone II.

Is this an electric or gass furnace - Eather of these can can have this problem its most recomendable that you call a seviceman .
in the case of electric furnace you may requier a new heat sequencer. And in the case of gass you may requier a new relay.

Posted on Feb 19, 2009

  • 52 Answers

SOURCE: Improper Termperature Readings during AC run

personally i'd just replace the thermostat, but try pulling the front panel off and look on the circuit board and see if there is a jumper for F/C or any other settings. you may try changing its position. you can also remove the batteries for 15 minutes and see if it resets itself. the only other thing it could be is a wiring issue.

Posted on May 29, 2009

kapishtech
  • 2272 Answers

SOURCE: Honeywell thermostat; Lennox elite series

When the furnace exceeds the temperature set by the thermostat, this could be indicative of several issues. The thermostat mounted crooked. When a thermostat isn't level on the wall, it can affect the automatic on/off function. To fix this problem, pop the cover off of the thermostat and loosen the screws attaching it to the wall. Straighten the device and tighten the screws.

If the thermostat is level and the temperature regulation system is still malfunctioning, the problem is most likely with the heat anticipator setting. The heat anticipator is a device inside the thermostat that governs when the furnace turns off. When the heat anticipator is on the fritz the furnace doesn't receive accurate direction, resulting in a heat system that either runs too long or not long enough. Usually, simply adjusting the heat anticipator, which is a small disc located underneath the thermostat cover, will fix this problem.

  • Temperature Does Not Reach or Exceeds Setting


  1. Thermostat is not level ? Use a level to realign thermostat.
  2. Anticipator not set correctly ? Adjust the anticipator.
  3. Thermostat not calibrated ? Recalibrate line voltage or low voltage thermostat.
  4. Range stop incorrect ? Clean thermostat and check .if same problem then,Replace thermostat.
  5. To clean thermostat.
  • Kill the power at the circuit breaker panel.
  • Remove the thermostat cover.
  • Clean the bimetal coil with a soft, clean brush.
  • Remove the thermostat body by unscrewing the retaining screws (on a round thermostat). Slide a piece of bond paper between the lever and contacts to clean them.
  • Reassemble the thermostat.

  • Thanks. keep updated for any more query.you can rate this solution and show your appreciation.

    Posted on Sep 21, 2010

    carmin77
    • 113 Answers

    SOURCE: I have a Honeywell EMM-3

    Zoning, in the A/C world, refers to different areas of the house which may be cooled to different temperatures. Zoning is accomplished by closing/opening vents.
    Zone 1, 2, 3 etc. do not have any particular meaning, except to indicate zone control flappers 1, 2, 3 etc. which are physically inside the ductwork which determines the zoned area.
    Just because you have this fancy thermostat, does not mean that your house is actually zoned, but I am not to sure why such a thermostat would be purchased if it was not (unless it was free).
    Zoning uses dampers. Is there air blowing out of the registers?
    :o).

    Posted on Jun 04, 2011

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