Question about LG LP153HD3A - 14,300 BTU, R410A, 9.4 EER, Heat PumpPTAC, 230V

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Why doesn't the compressor start in the heat mode

AC works perfect. Heating coil works perfect. However, compressor does not start and join with the heat coil in the heat mode

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Nathan Shaffer
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Is it a heat pump? Is it a heat pump stat? Is ambient temp high enough to allow heat pump to run?

Posted on Apr 09, 2015

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kilr69
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If heat pump, ohm out outdoor ambient air sensor.

Posted on Apr 09, 2015

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Check and make sure the thermostat is programmed to bring on the heat pump before the emergency heat.

Posted on Oct 18, 2014

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  • kilr69
    kilr69 Oct 18, 2014

    Heat pump. When call for heat is more then two degrees higher than indoor temp strips will kick in but if no outdoor unit there may be a problem with wiring at indoor unit or outdoor unit. If older than one year not under warranty. Look up manufacture an call 800 tech service number

  • kilr69
    kilr69 Oct 18, 2014

    Could also have leak and out on low pressure sensor. Look for signs of oil. Have crescent wrench in hand. Or call install company

  • kilr69
    kilr69 Oct 24, 2014

    open panel on outdoor unui, see if contactor is pulled in in either heat or cool mode. press with insulated instriment on contactor and see if unit starts. if so it is a wiring issue.if it worked before there is a 24v issue either in the air handler, thermostat, outdoor unit. Best guess is the thermostat.

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