Question about Ruud Central System Air Conditioner

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PROBLEM MY BLOWER IN THE ATTIC COMES ON ALL BY ITSELF WHEN NOTHING IS BEING CALLED FOR AND RUNS FOR 5 TO 10 MINUTES THEN SHUTS OFF

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  • Sideshowmel May 11, 2008

    My blower runs constantly even with all thermostat wires pulled from the board. I replaced the board and still have the same problem.

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You have a stuck fan timer or fan relay switch

Posted on Dec 20, 2007

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Thermostat wires or solid state control, (time delay board) sounds like your symptom.

Posted on Dec 01, 2007

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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

3 Answers

When air conditioner turns off out doors I can still hear it running in the attic.


Are you sure you are hearing the air conditioner running, or maybe just the blower? The blower may continue to run to further dry the evaporator core and reduce the chances of mold and mildew formation.

-Rod

Jun 03, 2017 | Heating & Cooling

1 Answer

Central heat works fine, but a/c does not come on and the blower in the attic doesnt come on when switched to cool only for heat. Touch R & G wires together nothing happens. R & Y nothing happens....


Probably not in the wiring unless you did it yourself. Most likely it is the outside unit that is not coming on for any number of reasons. Call a tech to trace the problem.

Apr 21, 2013 | Heating & Cooling

1 Answer

This is a Unico AIR HANDLER in a residential application with heat / cool unit in the attic. With system off (not calling for cool) and fan in auto mode, the blower fan is on high speed only constantly....


Sounds like a sticking relay. You can check the stat simply by remove the faceplate. If fan still runs with tstat cover off its not the stat. Not sure is your blower has a separate relay or if relay is mounted on control board. This can be bypassed with a new relay if you are willing. Good luck!!

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

Mar 26, 2017 | Heating & Cooling

1 Answer

My heater is not working. When the thermostat is placed in HEAT mode, it sounds like the blower is kicking on - but then it shuts down a minute later. I looked in the unit in the attic, and I can see that...


Yes. First go into the attic and look thru the the inspection hole in your furnace. It is a small hole with a glass cover you can look thru. Therer will be blinking light inside. The numrer of blinks tell you that what the problem is. Example three blinks means air switch open. Your problem could be ignitor,air switch or pikot. Get back to me asap and I will walk you thru this or call me. Rus

Dec 05, 2009 | Weather King 12AJA4801AH Air Conditioner

1 Answer

Blower in attic & AC unit outside continuously run


Sorry to hear about your miss-fortune, you are right it is an wiring problem. Can you turn off the blower with the thermostat (cool-off-heat) or what happens when you switch the fan to (auto or on) When you say the outside unit is "rigged" is it mechanically being jammed or electrically? If its mechanically that should be removed (what a crappy thing to do) other wise it will run continuously as you may already know. That is what it sounds like, you should just be able to shut the entire system down by turning off the switch to the furnace. If it is electrically being held closed, he changed some of the wiring around in the attic unit, you better hope he was lazy and jammed a stick in the contactor in the outside unit or else you may need to learn more about HVAC wiring, none the less I would double check the thermostat wires going to the attic furnace there should be nomenclature on the unit or at least somewhat marked. This was probably disturbed when the new blower was installed, by the way that was your initial problem. Good luck and becarful

Aug 17, 2009 | Ruud Matching Split Air Conditioner

1 Answer

Air handler only blows air for 3-5 minutes before shut off & not cycling frequently


Sounds like it could be a very weak run capacitor on the blower motor. Run capacitors are sized specifically to the needs of the motor. When a run cap gets weak, the motor trys to compensate for it by drawing more power. More power draw = more heat in the motor, then the motor will overheat and shut off to protect itself. When the motor cools off it will automatically restart and run until it overheats again. Keep in mind that I am a technician that normally diagnoses equipment in a hands on manner. There are many practices and concepts that transcend all air conditioning systems but it is a constantly evolving industry. I live in south eastern WA and I don't see Amana units except as window units. It is possible to have something else causing this problem (faulty thermostat, failing thermal relay(if used), problem with electronic controls(if used)) there are a lot of potential variables

Jul 02, 2008 | Amana PTH123B25AJ Heat Pump Air...

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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