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    designbo's Avatar
    designbo Posts: 4, Reputation: 1
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    #1

    May 30, 2009, 06:04 AM
    Compressor comes on but condenser shuts off
    When our compressor kicks on, the compressor will run and shut off or not come on at all. When running the discharge air is 64 degrees and the return air is 78 degrees. I have only a couple of answers, bad relay? Low head pressure? Or capacitor??
    laxweber37's Avatar
    laxweber37 Posts: 2, Reputation: 1
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    #2

    May 30, 2009, 09:51 AM
    What kind of unit are we talking about.
    designbo's Avatar
    designbo Posts: 4, Reputation: 1
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    #3

    May 30, 2009, 01:20 PM
    Quote Originally Posted by laxweber37 View Post
    What kind of unit are we talking about.
    We have a trane 4 ton heat pump with aprilaire 8344 non-programable thermostat. Unit runs great when the compressor comes on...
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #4

    May 30, 2009, 06:26 PM

    Sounds like it is low on freon and the low pressure switch keeps kicking out.
    designbo's Avatar
    designbo Posts: 4, Reputation: 1
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    #5

    May 31, 2009, 11:57 AM
    Quote Originally Posted by Joshdta View Post
    sounds like it is low on freon and the low pressure switch keeps kicking out.
    I would agree, but the unit ran all yesterday afternoon and last night and this morning and went to check this after noon and same thing. Turned unit off and waited for about 5 minutes and then turn unit back on and it is working fine. If it was low on freon, the freon line would be warm and no condensate on lines, also the discharge temp is what it should be around 64 degrees. Have plenty of condensate in return line so I'm at a loss here. Its around 100 here so it would help to discover answer...
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #6

    May 31, 2009, 12:34 PM

    Is this a heatpump? Or just a ac unit. Next time it goes off. Look outside in the electric panel and see if the contactor is still pulled in. If not sounds like a t-stat problem.
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