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My husband accidentially cut the thermostat wiring outside when doing yard work. He's wired it back, but the unit will not come back on.

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Turn power off to air handler. Inside air handler you should find a small 5 or 3 amp car like fuse either on a control board in inline on the red wire off th he transformer. Replace burnt fuse and turn power back on. Good Luck!!

Posted on Apr 17, 2017

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1 Answer

My husband accidentially cut the thermostat wiring outside when doing yard work. He's wired it back, but the unit will not come back on.


There is a breaker box next to the condenser outside. I would check to see if that has been thrown or the fuses are bad. Be careful as that is 120 volts. Also the unit inside your house if you take off the door depending on the year and model there is a fuse that blows and would need to be replaced.

Apr 17, 2017 | Heating & Cooling

1 Answer

Loose thermostat wire outside at condensor. Will not turn off when inside unit is off. If you wiggle thermostat wire or tap on housing it cuts off. What next?


That does not sound like a thermostat wire but rather a sticking .contactor If your unit runs after the thermostat shuts off and you tap the unit and it shuts off the contactor is sticking and needs to be replaced.

Jul 30, 2012 | Goodman Heating & Cooling

1 Answer

My breaker trips when the outside unit tries to turn on. The inside furnace runs. I cut the inside unit off and the breaker doesn't trip. I manually turn on the outside unit by depressing the cont


Hello, there is a short to ground somewhere, check all the wiring from the inside un it to the outside unit and make sure nothing is touching metal.

Jun 10, 2012 | Goodman Heating & Cooling

1 Answer

Furnice air blows, but my ac unit outside want cut on


if the inside unit is running but the outside unit isn't - I would check the fuses or breaker. I suspect you have a blown fuse or a tripped breaker.
What is also possible is that the 'low voltage' thermostat wire (coming from the thermostat inside the house) has been cut - possibly by a lawn mower or weed eater - or chewed into by a dog.
If this is the case - you easily splice (with all power off) the wires back together using the color of the individual wires.

Jun 06, 2011 | Heating & Cooling

1 Answer

Central air/heat pump not putting out cold air


I have some things for you to check. If you look at the outside unit the lines going into the house. Are they frozen? Have you had any yard work done, the reason I ask is they could have accidentally cut or pulled out the thermostat wires to the ac unit. Also, inside check for the same thing, frozen lines. Also, you may want to check the drain coming from the inside unit, it may be clogged.

Jun 22, 2009 | Heating & Cooling

1 Answer

My heating/cooling blower (not the outside unit but the fan in the garage) does not turn off, even when my Honeywell TH8000 is set on automatic. What can I do to have the fan motor shut off?


try hard wiring your 24 volt that goes to the outside unit to the yellow wire coming back from your thermostat make sure the yellow wire is on the yellow terminal on the thermostat (honeywell) i have run into situations when this seemed to be the only thing that worked

Jan 13, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Won't turn on


The unit in your back yard is the outside half. The one that blows room temp air is the inside half.

The outside half is not working. No compressor, no fan. That is a problem with the power. You will find the bad parts very close to where the power wires go into the outside half. It might be a bad relay that connects both the fan and compressor to the power. It might be a 3 terminal capacitor. It might be burnt wires.

Jul 24, 2008 | Carrier 38CKC042 Air Conditioner

1 Answer

Lightning struck outside our house last night. Air does not work. Unit outside does but the thermostat smelled like the wires were melting. Husband got a new thermostat but we can't get the unit to come...


lightning is in KVolt range, the exterior unit is most likely damaged at the low voltage cables to the thermostat, melted out, should get a sparky in to trace the lowV lines, and check out the unit, lightning is not forgiving

Jun 22, 2008 | Intertherm Heating & Cooling

1 Answer

Intertherm to Honeywell thermostat


Typically if you have a yellow wire in the "y" terminal blue is used as common or "c". As far as your jumper from rc to rh, that will depend upon what type of heat you have. If all of your heat and cooling come from your packaged unit outside, yes you will need the jumper. If this does not work maybe you have a bad breaker or transfomer.

Oct 12, 2007 | Intertherm P3RA-048K Air Conditioner

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