Low Speed Blower Won't Work In Auto Mode - HVAC - Page 2 - DIY Chatroom Home Improvement Forum

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Old 10-23-2008, 10:10 AM   #16
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Originally Posted by Eric F View Post
My blower motor has three wires: RED-heating speed tap terminal, BLACK-cooling speed tap terminal, and WHITE-neutral terminals. Does that man the white wire can be moved to the heating speed tap terminal? I believe somebody said the three wires were for different speeds. If I changed the location (change the taps) of the red wire at the harness connection at the blower motor, would that allow me to determine if the problem was with the blower motor itself?

Before I start looking for a blower motor, I want to make sure that is the problem. Any suggestions would be appreciated.

Does my Lennox G26 series unit have a fan limit control? Is it possible that is the problem?


Nope. It's a 90% furnace. Uses a control board.


hvaclover is offline   Reply With Quote
Old 10-29-2008, 05:24 PM   #17
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If you manually had to turn the fan on by cutting the switch to on and not auto then you need to replace the fan switch which controls fan by tempature.


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