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I have an ac unit that the heat strips come on with the ac.

I have an central unit the the heat stripps are coming on with the ac.

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  • Gary Davd
    Gary Davd May 11, 2010

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(1)Chek defective control switch
(1)Check if wiring is cross at some point

Posted on Mar 30, 2008

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you cant use that thermostat for a heat strip,your thermostat only gives 9 volts to tell the heat pump to come on,a heat strip needs 220 volts to run,DO NOT PLAY WITH ELECTRIC HEATERS!!you do not know what you are doing and can burn your house down or hurt someone!!

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When I turn the air on the heat strips comes on at the same time


Is this a central heat? From the size i assume it is.
You say air conditioning on part of your question then use heat pump on another part. So it is important for us both be on the same page.
With all due respect some people think they have a heat pump and it is just AC and electric heat also but is not a heat pump.
. If you have the outdoor AC unit running with your thermostat set for heat and the air coming off the out door unit is cold, or you see it "steam up outdoors" off the out door unit at times (we call this mode defrost).

If you actually have a Heat pump system some times it is wired to have the strips come on at the same time the heat pump comes on especially if you experience a lot of weather below 40' occasionally and have an emergency heat setting on your thermostat you most likely have a heat pump.

If you have a heat pump for sure now the heaters can come on with the outdoor section if
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Any 1 or combination of these 3 items can cause the elements to come on wit the out door unit.

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If you have a Gas furnace in the Attic then the answer is yes. The outside condenser will not run if in fact you have a gas furnace.

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What you are talking about I think are the strip heaters in the Air Handler this must be a Heat Pump system right??? If so please check your thermostat and make sure it is not in EMRGY HEAT mode.. One other note there is a 2 stage bulb system inside the stat if it is too cold outside and the heatpump on its own cant keep up with the call for heat the 2nd bulb closes and turns on the heater as a supplumnetal heat also these will come on or should come on when the unit goes into defrost.. plz let me know what it is you are trying to test and i can walk you thru it.. Also need a model # off the A/H to get a Wiring diagram

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