Lennox Heatpumps


Old 11-16-00, 03:55 PM
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I have a lennox model 19-113 heat pump. I just recently replaced the defrost module and the defrost line sensor because it wouldn't defrost. Now it still wont defrost itself and I dont have the schematic to trouble shoot. If anyone has a solution or a copy of the shematic for this model, I would be very greatful for your help.
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Old 11-16-00, 04:06 PM
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Have you checked to see if the unit is under or overcharged with freon. Both can cause freezing of the outdoor coil. So can a very dirty outdoor coil. Does the outdoor fan shut down when it goes into defrost? Is the reversing valve stuck or bleeding? Your problem sounds more mechanical than electrical.

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