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Have a Janitrol central air system and the unit outside comes on but the fan in attic does not always come on. If I go to the thermostat and manually turn it from auto to on it comes on. Any ideas about what is happening?

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If the blower is working with the thermostat in the ON position that tells you that the fan motor works. In the AUTO setting... the system in controlled by the contacts in the thermostat. 1. The thermostat contacts might not be closing. 2. A contactor( or relay ) in the air handler unit(inside unit) might not be closing to send the signal to the fan motor. It sounds like a thermostat or relay problem to me. You can email me at Starztruck4u@aol.com if you have more questions.

Posted on Aug 10, 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.

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

Jun 28, 2017 | Bryant Heating & Cooling

1 Answer

I turn on the Central A/C unit with the thermostat. The attic fan unit goes on and the system cools the house. When the system shuts down the fan unit shuts off but the outside compressor keeps running....


could be a thermostat problem but even more likely the contactor on the unit outside is stuck. In order to change this part you will have to get in to the outdoor unit. The contactor is the automatic switch that the thermostat energizes when the thermostat calls for aircond. The location of the contactor is in the outdoor unit (electrical section) and where the power will tie in to the unit. It is a little box looking part with terminals where most of the wiring connects. If the contacts are welded together the outside unit will not shut off. If you tempt to replace this part, make a diagram of all the wires connected to it before you take any of them off. Turn off all power to the outdoor unit before inspecting.

Apr 13, 2011 | Heating & Cooling

2 Answers

It is freezing inside, and it is not cooling properly


Welcome to FixYa,
Check the Following
Is your filter clean? Look and the evaporator in the inside unit. Is it frosted up? Do you have condensation water in the pan? Go to the outside unit and feel the air coming out of the fan. Is it warm? Now feel the 2 copper pipes coming out of the unit. Is the small one warm or hot? Is the larger one cool ? Is there moisture on it?
Air conditioner runs but doesn't cool at all
If the airflow is good and the air coming out is not cold, your home air conditioning problem may be a temporary problem - your coils may have frozen. Turn the unit off for an hour to let them thaw, then try again. If cold air is now present, freezing coils were the problem; if the problem recurs soon after turning on, you may need to replace the coils. Again, call a pro. If you have ceiling vents in upstairs rooms and the air flowing from them is consistently warm, you probably have leaky or poorly insulated ductwork in your attic. See my Attic ceiling insulation page for more information on insulating ductwork that runs through attics.
Another likely home air conditioning problem if you have good airflow but no cooling is that thebreaker to the outside unit is shut off, which, depending on the installation, can either cause the air conditioning system to not run at all, or to appear to be running but not provide any cooling. If you can hear the compressor fan running outside, the breaker is on, but if the outside unit is silent the outside breaker may be off. If switching it on does not solve the problem, look for the high pressure cut outon the condenser and try resetting that.

Check this Link for Detailed Repair Click here

Hope you got an Idea...Thanks for Contacting FixYa...

Jun 29, 2010 | Goldstar Heating & Cooling

1 Answer

Hello We have a Trane central air


Bad thermostat, improper wiring or bad circuit board in furnace. Turn off the disconnect outside.

Dec 30, 2009 | Heating & Cooling

2 Answers

The outside unit is not working on my Heil Air conditioner


The attic fan is not a part of your a/c system, and you should not run it while you are running the a/c. If you are currently using the attic fan, it is possible that someone wired it so that the a/c won't turn on while the attic fan is on. Otherwise if the thermostat is set below room temp, and says it is calling for cool, then the problem is most likely coming from an issue at the outside unit itself. Make sure to check your fuses, at the fuse panel and outside breaker. Hope this helps

FYI.. the only part of the system that might use batteries is the thermostat.

Jul 28, 2009 | Heating & Cooling

1 Answer

Unit makes noise, but no air is coming out of vents


check the unit in attic for iced up and outdoor unit you may notice ice on lines or connecting tubing and in attic also-------- if so turn unit off at thermostat and leave fan switch on the thermostat to on while sytem switch is off
should be nothing running but the indoor fan
will have to thaw if it is iced up for a while couple hrs. a guess
you will know when it is thawed as your airflow will begin to come back

check your air filter to be sure it is clean
suggestion only-- keep your house thermostat set at 70 degrees or above
you may have developed a refrigerant leak (freon) which would require a hvac service tech to verify.
if it was iced you can turn all back on and try again once you have good airflow again.
or if your system has not been serviced lately? might be a good time to have it serviced?

Jun 21, 2009 | Heating & Cooling

2 Answers

Furnace runs on heat, air conditioner does not


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.

Feb 11, 2009 | Ruud Central System Air Conditioner

1 Answer

Central heat unit not blowing


Is your unit a Split system where one unit is inside (attic, garage, utility room) and another outside?? Is the outside unit unit running?? Is your thermostat electronic or the regular slide mechanical type??

Jan 17, 2008 | Heating & Cooling

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