Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

1 Answer

Thermostat says ''Aux heat on'' and buzzes when we turn on heat

We have a honeywell thermostat. When we turn the heat on, the words, "heat on" blinks. Then, we hear a buzzing sound, sort of like an alarm and the panel on the thermostat says, "aux heat on".
Ideas???

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  • brentavius Nov 30, 2008

    I have a RUUD that has started buzzing incessantly. I do have a heat pump, and it is working. I'm not having the issue with the aux heat light, but the buzzing at the thermostat itself is loud and distracting. I've gone in and tightened all the screws, but no help. Do I just need to replace the unit?

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  • 11 Answers

You most likely have a heat pump, the aux heat (usually electric) comes on anytime the room temperature is 4 degrees below the thermostat setting. Does the buzz go off when the aux heat lite goes out? If the aux heat does not shut off then the primary heater (heat pump) is not putting out enough heat to satisfy the thermostat. I need a little more info. Do you have a heat pump? Is it working?

Posted on Nov 26, 2008

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FurnaceGuy
  • 74 Answers

SOURCE: Buzzing sound when aux heat comes on

Sounds like it could be a effiency function to warn you that the heat elements are on. Check your thermostat manual and see if you can turn this feature off. If this is not a feature then the thermostat may be wired wrong or something in the circuit may be trying to short out.

Posted on Jan 04, 2010

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Posted on Jan 02, 2017

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