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High efficiacy 90 furnane does not blow high heat; yet the fan motor blows but not hot heat.

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If the furnace blows heat, just not hot enough, you need to have a furnace company come out and adjust the manifold gas pressure. (This is not something a homeowner can to, it takes special tools)

Posted on Jun 18, 2008

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Ac works fine when fan is on low but fan cuts off after a couple of minutes on high


Bad fan motor. Multi-speed motors have a set of windings for each speed. Your high speed is bad so the only solution is to replace the complete motor. When motors are going bad they will over heat and kick out on the heat safety. As it cools back down it will start again for a short time again until it gets hot again.

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Wall AC Unit blows cold air for a little bit then blows hot air. If I turn it off for a while, it will do the same thing.


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1 Answer

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Is the compressor running? Check the circuit breaker or disconnect that is close to the outside unit if it isn't. It may be tripped on high pressure since the fan isn't running. If the unit has power, use a screw driver or something that will reach the fan blades and spin the fan to make sure it turns freely. If it doesn't the fan is probably bad. Next, check the capacitor for the fan motor. If it looks swollen then it is bad, otherwise check it with a multimeter. Most heating and air suppliers will test it for you. If the capacitor is good, the problem may be you fan motor.
You can check the fan windings with an ohmmeter.

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1 Answer

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Dec 06, 2009 | Air Conditioners

1 Answer

Wall A/C only SPORADICALLY blowing cold air. Turn it off and back on, you can feel it's cold, but only if you're 5 inches from it. After a couple of minutes, fan is only blowing warm air again. Vacuumed...


if it blows be not with force like it used to it can be fan motor capacitor not boosting fan speed. but if speed is not the issuse. remove and clean both coils water hose

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1 Answer

Air conditioner and heat blower


You will have two fans, one fan blows out the rear of the unit that cools the condenser soil, one blows out the front across the evaporator that blows the cold air out into the room. Some window a/c's have whats called a squirrel cage fan assy. that has one motor that runs both fans. So you either have one bad fan motor (the evap fan motor) or you have a bad fan blade that has fallen off the shaft. Also check the filter see if it is clean.

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I need to replace my condenser fan motor. I replaced it once before but instead of blowing out the top, it was blowing on the condenser. Should it blow out of the top? If so, what direction should the...


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1 Answer

I own an armstrong air unit after about 30 minutes the unit seems to get hot and the fan quits the compressor is still running I changed the motor on the fan and it still does the same thing I have also...


Chech the fans rotation , the fan is suppose to blow air out the top, also if you changed the fan out ,check for the blade on right, its suppose to scoop the air from the inside and blows it out the top,, also replace the capicator...sounds to me like the motors getting too hot and tripping on internal ly high temp. Hey, slow down "Big Money"! The problem is around the fan location! Thank-you-very-much!

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