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My Honeywell thermostat T874R is showing the EM heat indicator light when I turned the AC on for the first time this season--Why? House is warm but not humid.

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  • Anonymous Mar 20, 2014

    Thermostat display showing-ac and furnace will not turn on

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2 Answers

The above was posted by fixr1st

Posted on May 29, 2008

The T874R thermostat should be a heat pump thermostat. EM means emergency heat which you obviously are not using. That means that you just need to determine if your heat strip is on while you air conditioner is working. If so you may need to replace your thermostat or you heating relay or sequencer.

Posted on May 29, 2008

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