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My lennox heat pump frequently shows df and cold air pumps out for about 5 minutes then restarts. what is causing this?

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Its getting too cold outside for the heatpump to operate. It must defrost the coil. You should have backup electric heat inside your airhandler, possibly not setup or possibly not even there. On your tstat in settings or set up look for heat pump with back up electric heat

Posted on Dec 11, 2016

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Posted on Jan 02, 2017

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I have a Lennox model CB19-51-1P air handling unit with HP19-511-1P compressor heat pump unit. I just turned the heat on for the first time this season. And I am getting low heat volume. The heat pump...


first thing you need to check is if the reversing valve is working you maybe running your A/C with the heat strips on depends on the t-stat your using some heat pumps will bring the strips on with a high degree difference in setting and room temp .

1- turn t-stat to heat set temp 10 degrees above room temp if you have a programable t-stat it will have a time delay on it allow to for the outdoor unit to come on 2 to 5 minute usually .
2- walk around to the outdoor unit when it comes on feel the big line the insulated one and see if it is hot or cold let it run for a 5 minutes peel back the insulation and gently grab the line with your hand it maybe real hot so be careful if this line is hot then your heat pumps is working mechanically and if it is just warm then you may need the charge topped off

there are so many different option's from this point i will need to know the findings of this test first thanks : Michael

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It is normal. Your house has to go down a couple more degrees because the heat pump is not working. You can solve this by rewirng you thermostat. Take off the wire that goes to Y and tape off. Then take the wires that are marked w and e or w1 and put the wires to yellow. Do not run ac with it wired like this. If you need more information please post me back

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1 Answer

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


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

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