Central Heater Does Not Work In Auto - HVAC - DIY Chatroom Home Improvement Forum

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Old 01-25-2013, 09:34 AM   #1
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Central Heater does not work in Auto

Hi, I live in Florida and have a forced air central AC unit with 15kw heat. The AC works ok but the heater and air handler won't come on. All I hear is a relay or something that clicks like the heat is beginning come on. The air handler does not come on and I can see that electrical load is becoming lighter after a few seconds followed by another click. If I select the fan to run and I slide the heat on, it comes on running very well.
Incidentally, while running the heat in manual mode, I put the Auto/fan switch into auto and the fan speed dropped to half. I'm not sure if the airhandler is two speed or not. I seem to have both both phases working.



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Old 01-25-2013, 07:05 PM   #2
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Could be a bad sequencer.


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Old 01-27-2013, 10:07 PM   #3
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Hey, thanks that sounds logical.
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