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This is likely because you haven't changed the setting on the tstat to electric heat. Tstats typically come from factory programmed for gas heat which means the unit controls the fan rather than the tstat controlling the fan. Sometimes a switch on back of tstat others are in the settings menu.
See if there is 124 VAC across the common and the red wire. If not then the thermostat transformer inside the unit will have to be replaced or the fuse changed if it has one(not likely).All t/stats are not the same. If your T/stat doesn't have a provision for the 2nd stage or emergency heat then you have the wrong T/stat That will definitely blow the transformer that supplies 24 vac to the control relays
you likely have a "two stage" system, but not a two stage heat pump. the first stage is probably the heat pump itself, and the second stage is the auxilliary resistance heat that suppliments the heat pump at lower temps. if i knew the terminals that are available on the new stat, i could advise you on the proper wiring.
Sounds like a set up issue on the tstat. You say this is a packaged unit, inside the machine you should find where the tstat wires hook up. Typically red is power yellow is compressor orange is reversing valve white is emergency heat green is blower. Put red and green together, test blower. Then red green and yellow, make sure blower works again. If blower runs both ways it's either the tstat wire or tstat itself. Make sure you are landing wires on dedicated heat pump terminals, make sure in settings you are set up for heat pump with back up electric heat and TSTAT CONTROLS THE FAN. Good Luck. Also if there is a switch on the tstat for gas or electric on the back you want electric.
Check all of you wire connections. If they are all clean and secure you probably have bad board. Just because the circuit board is new does not mean that is good!
If your running gas heat it's 5/8 3/8 tubing.If it's elec. heat it's 3/4 3/8 tubing. Etheirway 3/4 3/8 works for both. Use 6 wire for tstat from tstat to furnace or air handler, and you need is 2 wire from condensing unit [outside] to furnace or air handler or anything more than two.
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