AC works perfect. Heating coil works perfect. However, compressor does not start and join with the heat coil in the heat mode
Is it a heat pump? Is it a heat pump stat? Is ambient temp high enough to allow heat pump to run?
If heat pump, ohm out outdoor ambient air sensor.
Check and make sure the thermostat is programmed to bring on the heat pump before the emergency heat.
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
Could also have leak and out on low pressure sensor. Look for signs of oil. Have crescent wrench in hand. Or call install company
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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