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Old 10-01-2011, 05:22 AM   #1
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Automatic heating/cooling and fan...


Hi guys,

My first post here and hoping for some help...

I have a gas furnace Lennox whose blower motor died some days ago. I called a guy to replace the motor for me and he put this model on:
http://www.acfurnaceparts.com/32663-...wer-motor.aspx

Everything looks to work fine, only that the way I control heating/cooling has changed. Before, I could just choose heat (thermostat Robertshaw) http://www.robertshawtstats.com/modu...e&prodID=67345 and the fan together with the heat pump or furnace would start automatically (a second or 2 after setting the temperature). When the room temperature was the same with the one set on the thermostat, fan and heat pump/furnace would stop automatically and starting (both) again automatically when temperature was going down. Now, I have to set the temperature, but nothing would happen till I manually press the fan button. It takes like 3-4 minutes until the heat pump starts heating and the fan keeps going even after the temperature is reached and the heat pump is stopped. I have to go again at the thermostat and stop the fan manually. That's not convenient at all as I do not want to have the fan going and going...Motor is set to high speed and after changing blower filters I get some real noise from one duct entry in my room. I called the guy who replaced the blower motor, but no answer from him...

Do you think it's a wire connection problem here or just a thermostat setting?

Thanks in advance for your help!


Last edited by harvest; 10-01-2011 at 05:28 AM.
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Old 10-01-2011, 05:56 AM   #2
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Automatic heating/cooling and fan...


We could speculate on this all day, but you are going to need a competent tech out there.

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Old 10-01-2011, 07:53 AM   #3
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Automatic heating/cooling and fan...


Probably knocked a wire loose or forgot to reconnect one while changing out the motor.
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Old 10-01-2011, 08:16 AM   #4
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Automatic heating/cooling and fan...


Im just wondering BT, what could you leave off that would disable automatic fan control?
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