Question about Amana PTH123B25AJ Heat Pump Air Conditioner

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

Dear Chillm,

Amana 13 Seer heat pump, entire system 11 y.o. incl air handler in attic. 2.5 ton unit on 1 story brick ranch approx 1400 sq ft, 8" blown insulation in attic, w/ peak roof and eave vents.

When outside unit comes on, air handler will only blow through vents for about 3 to 5 minutes before it shuts off - will then come on again and blow hard for about 1 minute. Air coming out of interior vents is cool, just won't blow long enough to cool house. (N GA - temps in the mid 80's - heavily tree shaded house.)

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  • Ga photog Jul 02, 2008

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  • 104 Answers

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

Posted on Jul 02, 2008

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