Question about Bryant 463AAC008BA Air Conditioner

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No power to ac unit

No power to bryant ac unitin Attic, fan is not running. No sign of power in attic-unit.

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Hi,
Check the breaker for the unit or check to see if the disconnect by the unit in the attic has fuses that may be blown.
If the breaker is tripped or the fuses blown, then check to see what caused them to blow...

heatman101

Posted on Aug 16, 2010

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Posted on Jan 02, 2017

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2 Answers

2002 4 ton Bryant air conditioner shuts off, fan still runs but not cooling is problem in the controls in the attic or in the AC unit or both?


With a non heat pump it is a simple 24 volt AC control circuit. In the attic there is a relay that is actuated via the fan control wire directly from the thermostat. On the thermostat there is an auto/man switch that controls the fan. Manual the fan runs all the time. Auto fan turns on and off with the outside compressor.

If the system is not calling for cool and the fan continues to run the fan relay is sticking. common problem. Sometimes after running for several days the relay will stop sticking if not, replace relay.

If the system is calling for cool and the compressor stops I would still expect the fan to run until thermostat tells the A/C to off. Some compressor units include a safety switch or high-pressure cut-out switch A blocked internal valve bad control board or external fan in outside unit defective no air flow in outside unit.
High pressure cut out not good,

Suggest turning temp max cool and observe. If acceptable cool and the compressor runs without interruption all is good, except for the blower in the attic. Safely check relay in attic blower circuit.

Hope this helps.

thermostat-heat-cool-fan-on-czwsw2ci0layswcsyy3dj4dr-4-2.jpg

basic-thermostat-wiring-diagram-czwsw2ci0layswcsyy3dj4dr-4-5.jpg

Jun 28, 2017 | Bryant Heating & Cooling

1 Answer

My(38ycc030340)carrier heat Pump ac unit blows 5 amp fuse on board in handler in attic when switch stat to heat.


Miss wired or shorted low voltage wiring. Have you changed stat? Animal chewed wires at foundation wall or in attic?

Oct 10, 2016 | Carrier Heating & Cooling

1 Answer

The goodman air conditioning unit will randomly turn on and run for a few minites then turn off. The blower fan does not run just the unit in the attic. Any advice?


Hi, not enough detail not enough detail. I have no idea where you are located, but if it is a gas heater/ Ac then maybe the attic space is so hot that the over temperature sensor is turning the unit on in an attempt to cool the system down. If however it is a refrigerant AC unit, I would suggest that the control circuit is faulty, maybe a sticking contact somewhere. good hunting col

Feb 24, 2011 | Heating & Cooling

1 Answer

I had my a/c charged today because it has not been cooling the house down. It took less than a pound, but it still blows worm air. Fan and compressor all running. I cleaned outside unit, filters, replaced...


It could be that it is not charged correctly. Check the insulated copper
line outside if it is sweating and the condensor is discharging hot air, then the ac is doing all that it can. Check the evaporator inside to see
if the drain has condensate coming out of it.

Getting the heat out of the attic is a good idea, but you must have enough make-up air in the attic for the fan. If you do not have enough
make up air, it will start to draw air from inside the house. One way to check this is if you have a gas water heater and or furnace. If you put
a flame by the exhaust pipe in the basement and it blows it out, then you now have a backdraft problem.

Run the AC withoutthe fan, my real guess is the unit is not properly
charged or you do not have a big enough AC unit.

Jul 17, 2010 | Goodman CKL36AR36 Air Conditioner

1 Answer

Outside unit is running but blower in attic is not working line in attic from outside unit is dripping water


You need to get the blower motor going, the unit is froze up. Try switching the fan spped wires on the control board on the unit in the attic.

If that does not work, replace the motor

Jul 03, 2010 | Heating & Cooling

1 Answer

I have a Carrier 38tra048340 ac 4 ton unit outside, heater in attic. Thermostat is Totaline P374-1100. Power went out than back on after a few hours due to vehicle crashing into power pole. AC was running...


Blank screen sounds like a fried thermosat. Abrupt outages can affect certain types of thermostats. Make a jumper wire and jump across R and G. See if you get any action from anywhere. If a fan or compressor kicks in you know you have a burned out thermosat...

Jun 23, 2008 | Carrier Heating & Cooling

3 Answers

Blower in Attic not running


inside unit has fan control relay , either on control board or can be separate ,except for the 24 volt transformer and the t-stat the units operate separately concentrate totally on the inside unit this is where the problem lies

Oct 23, 2007 | Ruud UAMB Air Conditioner

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