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Old 08-14-2011, 10:48 AM   #1
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lennox heat pump shuts down


Iím having problem with a 1996 Lennox heat pump Hp 026-037-7p
I believe the current problem was brought by the condenser fan
Going out over several weeks, and the unit getting to hot and short
cycling too many times. The condenser fan and coil have been replaced.
The air handler was replaced 1.5 years ago, itís a APH made by York.

At this point, the System will run for several hours (7-20) then shuts down.
The contactor will be in the run position, but the fan and compressor will not run.
The circuit board has two lights that blink steady, indicating ďnormal operationí
The condenser fan will occasionally kick on and off during this shut down phase.
My neighbor let me use his gauges to see whatís happening during shut down.
I monitored the gauges every half hour and found them to be steady at 65/200
while the system is running.
When the unit shut down the gauges went to 125/160 after a half hour, 150/160.

When the unit shut down, I turned the thermostat to the off position, and give it 1-2
Hours to cool down. After an hour I re-start and found the gauges to be 55/180.
Ive taped a cooking thermometer to the top of the compressor and found it to be running at a consistent 165 degrees F.

Any thoughts?
Sully2

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