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I have a simple comfort 2311 thermostat on heatpump split system condensor unit not coming on and screen is reading eh.

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Posted on Jan 02, 2017

rockitman187
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SOURCE: Heatpump A/C not working

First,Turn on the heat cycle (Not Emergency)and see if the outside unit come on,If not,and you don't have low voltage outside,Go to the inside unit and test the transformer,If you have low voltage from the transformer but not outside,It is the low voltage wires,If you don't have low voltage from the transformer,It's the transformer.If you have low voltage outside when in heat mode,but the unit won't come on,It's the contactor.Let me know if you need more help.


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Posted on May 13, 2009

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switch the fan to 'ON' at the thermostat... this is the midpoint of the system electrically. If the fan comes on check for voltage at the condensor unit. a check to see if the thermostat is the problem... remove the thermostat and connect the red, green and either the white or yellow wires (not both) if you chose white you should have heat...yellow AC...

most split system AC have a small buss fuse on the control circuit board of the indoor unit. looks like a glass tube with metal caps held by metal clips. In 40+ yrs experience I have found it is more likely one or both of the 30 amp buss fuses near the outdoor unit (replace both even if one is still ok) or a 30 amp breaker in the quick disconnect box.
In many systems the control voltage to the thermostat derives from a transformer in the outdoor unit... it could be as simple as a broken wire. Without a full diagnostic, a complete description of the unit ( AC or heat pump, etc) this is all speculation

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I have a Select Comfort 2000 thermostat. I just replaced new batteries couple days ago. The past week my heat will be working fine all day and/or night then suddenly it will not kick in and the aux light...


Sounds like you have a heatpump. Is that correct? When it gets under 35F or so the heatpump just isn't able to keep up with the heat demand and will require help from a backup source such as electric strip heaters. The way the thermostat works is that the heatpump will work until room temperature gets 2F to 4F below what you have the thermostat set for, the Auxillary heat will kick in to help out. I think I am answering your question, please let me know if I have misread your problem and I'll try to come up with something else.

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Jan 31, 2010 | Heating & Cooling

1 Answer

Outside unit runs continuously, even when system is off.


On A/C units, there is a low voltage line that leads to a contactor, which engages to close the high voltage circuit to the condensor unit. Over time, the accual contacts in the contactor can weld themselves together. Try shutting off your furnace breaker but leaving on the one for the outside condensor unit. If it still runs, your contactor probably needs replaced. Contact a licensed electrician or HVAC contractor and tell them you think your contactor is in need of replacement. Is a fairly simple and quick replace, but the contactor itself is not cheap.

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2 Answers

Heatpump A/C not working


First,Turn on the heat cycle (Not Emergency)and see if the outside unit come on,If not,and you don't have low voltage outside,Go to the inside unit and test the transformer,If you have low voltage from the transformer but not outside,It is the low voltage wires,If you don't have low voltage from the transformer,It's the transformer.If you have low voltage outside when in heat mode,but the unit won't come on,It's the contactor.Let me know if you need more help.


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May 13, 2009 | Goodman CLQ36AR49 Air Conditioner

1 Answer

Hi the compressor on my split air conditioning unit will not cut in .the indoor unit runs and the compressor light on the indoor unit lights up?


If the system is appearing to turn on, but no compressor, Check the capasitor on the condensor unit. If you open the service panel, you can test the compressor by pushing in the contact switch. If you push the switch and all comes on, Replace the thermostat after checking to make sure the thermostat wires are not cut or disconnected. The capasitor usually looks like it is swelling if it has gone bad

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It sounds to me that the wire going to y2 on the furnance coming from the thermostat was not wired back up this is the wire that supplies control voltage to the contactor on the condensing unit. I would call the installer who changed the furnace out back to remedy this problem.

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