Question about Goodman Manufacturing Goodman ARUF182416 Air Handler, Multi-Position, Direct-Drive,

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AUX Heat kicks working Intermittently or not at all.

ARUF182416 set up with Heat Pump. The unit won't call for heat strips even when the thermostat calls for aux heat. If I open it up and test everything everything checks out fine, when I put the meter to the sequencer then set the thermostat to call for aux heat AND THEN flip the breakers on, everything powers up and the heat strips are engaged and I get 24volts on the cal to the sequencer and 240 on the strip side of the sequencer. When I put it all back together it will work intermittently and sometimes a power cycle will get it to kick on when it doesn't want to play nice. I'm thinking the control board needs replaced but was hoping to get a professional opinion. . .

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  • nwhite Jan 21, 2013

    UPATE: I actually found a loose connector from the control board to the 24V transformer. I attached it securely and it has been working great since. I will be keeping a close eye out as the weather dips this week and if the results are consistent I will close this out. My only guess is that opening the cabinet and moving the wires around as I was checking things out was enough to make contact and then shortly there after from the fan runnig it would vibrate back loose again so it wouldn't work.

  • nwhite Jan 31, 2013

    UPDATE: After troubleshooting the issue further, I have found the the control board only controls the blower and not the thermostat. It only provides power to the thermostat and the thermostat calls for the aux heat. After powering down the unit for a while it always works and I can measure voltage accross the w2 wire in the thermostat when the heat strips are on. After running for a while it stops working and there is no longer voltage on w2. I am replacing the thermostat and will close out the issue when it has worked for a while.

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