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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1 Answer

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