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

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Home air conditioning too cold at "Fan On" setting

When I set the thermostat on my home air conditioner to "Fan On" (rather than auto), the compressor engages no matter what the temperature setting. In other words, it doesn't merely recirculate the air but continues cooling.

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Sounds like you have a wire shorted between y and g somewhere. Maybe a bad tstat. email me if you have more problems james3751@gulftel.com and I may be able to walk you thru the troubleshooting

Posted on Jun 04, 2009

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You could have some wires touching or a bad t stat. take the cover off t stat after cutting power to furnace either at the furnace or breaker box. take wires off terminals G and R on t stat and wire nut them together return power. the fan should only be running. it compressor comes on with is cut power to furnace un hook all the wires make sure they aren't touching leave R and G together see if compressor comes on if so do the same thing on furnace with a jumper accross R and G. if the compresor comes on again un hook all the stat wires on furnace and t stat and ohm the wires out to see if you have resistance between any of the two wires together. if you do you have a short if the fan comes on by it's self any time while hooking wires on R and G together you have a bad t stat

Posted on Aug 08, 2009

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When the air condition reaches the set temperature to cut off the blower motor keeps running and i have the thermostat set to auto on the settings.


check the operators manual but you will probably find that the fan will keep running so that the air in the room is circulated past the thermostat so that the temperature can be monitored and the compressor switched on when the temp reaches the upper limit

May 30, 2016 | Heating & Cooling

Tip

Air Conditioners Cooling Tips


  • Whole-house fans help cool your home by pulling cool air through the house and exhausting warm air through the attic.
  • Set your thermostat as high as comfortably possible in the summer. The smaller the difference between the indoor and outdoor temperatures, the lower your overall cooling bill will be.
  • Avoid setting your thermostat at a colder setting than normal when you turn on your air conditioner. It will not cool your home any faster and could result in excessive cooling and, therefore, unnecessary expense.
  • Consider using an interior fan in conjunction with your window air conditioner to spread the cooled air more effectively through your home without greatly increasing your power use.
  • Avoid placing lamps or TV sets near your air-conditioning thermostat. The thermostat senses heat from these appliances, which can cause the air conditioner to run longer than necessary.
  • Plant trees or shrubs to shade air conditioning units but not to block the airflow. Place your room air conditioner on the north side of the house. A unit operating in the shade uses as much as 10% less electricity than the same one operating in the sun.
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    1 Answer

    Auto/On set to ON. Fan runs.


    Sounds like the thermostat, the way to verify is to unplug indoor unit, remove thermostat, take pic of wiring with phone or label the wires as to the terminals. Carefully twist the yellow,(Y) Red (R) and the green (G) together. Plug the furnace back in, if the unit operates normally, replace the thermostat. I am basing this on the fact that the blower speed is changing. This could also be an anomaly within the circuit board in the furnace section, not likely though as the outside unit (condenser) is not controlled n by the indoor board unless this is a heat pump. hope this helps. D

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    At your thermostat ,
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