Lennox Heat Pump Problem

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Old 03-20-07, 09:24 AM
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Lennox Heat Pump Problem

My Lennox heat pump keeps shutting off, particularly when it gets to be kind of cold outside (<40 degrees). There is a reset button I can push and when I do, it starts right back up. I had someone look at at and he thought the pressure was getting too high. He checked the pressure and it was fine and put it into and took it out of defrost, to make sure that was working OK, and it was. Anyone have any other ideas of what the problem is. I should note that it is about 19 yrs old, so I'm not surprised it is having problems, but I'd like to ride it out another year or so if possible. Thanks.
 
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Old 03-20-07, 09:44 AM
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Wink

First thing Id look for here. Is the blower blades clean?????
Filter clean and new every 30 to 90 days???? Is the indoor coil clean??? Outdoor coil clean. 19 years old you can have a lot of dirt in them
 
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Old 03-20-07, 09:49 AM
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The first time it happened, the filter was very dirty (that was about a year ago). Have been pretty diligent about changing the filter since. It just started becoming a real problem in the last month or so. The guy who did the diagnostics said he would have seen pressure problems if the coils were dirty, but everything checked out perfect.
 
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Old 03-20-07, 09:58 AM
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That old Id for sure check and clean the coils here first
 
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Old 03-21-07, 08:22 PM
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dirty indoor coil

I'm with Ed- 19 years old, kicks off on high pressure during heat- dirty indoor coil/fan. You mentioned the tech said the pressures looked ok. Well, the freon charge can be monkeyed with to cause the pressures to seem ok. Take a second look at the indoor coil.
 
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Old 03-24-07, 06:31 AM
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if it's heat mode, the technition should check the sub cooling of the unit.
Sub Cooling is a way to check the charge of the Heat Pump.
If the sub cooling is ok, the evaporator is clean, your filter is clean, the air flow through the coil is ok.
Then your pressure switch may be starting to fault.
Just like a circuit breaker everytime it trips it gets a little weaker.
19years of service it maybe time to consider a new unit.
Waiting another year is like saying I'm going to give money to my utility company instead of investing in your home for a year or two.
 
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