Condenser fan starts and stops intermittently.

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Old 12-10-14, 02:52 PM
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Condenser fan starts and stops intermittently.

Rheem condenser fan starts and stops intermittently in heat mode. Old fan burned out. Replaced fan and cap( old was good). Replaced defrost control. Still does it.
 
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Old 12-10-14, 04:08 PM
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Welcome to the forums.

It is normal for some condensor fans to run intermittently when in heatpump (heat) mode.

How was the fan when in A/C mode ?
 
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Old 12-10-14, 04:11 PM
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Welcome to the forum!! The best place to start is to test the contactor wiring to see if the required voltages are present. Also, inspect the wires for burnt terminals. The attached diagram shows the points that voltages need to be tested. The meter needs to be on the volts AC setting and all tests done ACROSS the leads. These tests need to be with power on so extreme caution is required due to lethal voltages present. The contactor may look different, but test points are the same. To better assist, please post model number of condenser.
 
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Old 12-10-14, 04:12 PM
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The outdoor fan motor should turn off when a heat pump enters defrost mode.
You should also hear the swish of pressure release as the reversing valve switches over when a heat pump enters defrost mode.

Is it possible that this is what your see?

What is the model number of your heat pump?
 
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Old 12-10-14, 04:13 PM
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Wow, I should learn to type with more than 2 fingers.
 
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Old 12-10-14, 04:29 PM
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Rheem model RPLA-31jaz. Seemed fine during ac season. Just noticed this change a few days ago. It is not a variable speed system . 12 years old. 180/65 pressure with 70 room temp and 45 outside. Only thing I have not checked is a loss of voltage while it runs. Fan runs for 2 minutes then shuts off for 8 with compressor running. Not in defrost.
 
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Old 12-12-14, 10:44 AM
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Your defrost board sends power to the fan motor, but more likely the capacitor is faulty or weak, weak capacitors cause low airflow and possibly cause the motor to overheat. If the cap has been weak for a long time it could cause the bearings to fail. If your not comfortable working on high voltage call a pro. If you can prove power is off, finding the exact capacitor and replacing it should not be hard.
 
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