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Old 12-06-2009, 07:19 PM   #1
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Short in Heat Pump condenser


I have a 14 month old Goodman 3.5 ton heat pump with oil fired furnace back up. Worked great up until the recent power outage, Noticed was getting cool in house even though furnace fan was running. Condenser was not. Switched to backup heat and everything was fine again. Next day I replaced the contactor which had a fried 24V coil and tried it. Now it blew the primary control on the furnace and smoked the Honeywell IAQ thermo. I then measured the low voltage at the contactor with the 240 power on and I am getting 120V on the low voltage contactor coil. I replaced the defrost control, no change. I have checked for shorts in both comp. and fan mtr as well as capacitor and no shorts to ground. Has me stumped, I don't know how 120V is getting to the low voltage circuit. As long as I keep the blue wire disconnected from the low voltage circuit everything works ok as far as the backup heat is concerned. Does anyone have an idea as to what is going on here? Thanks

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