Lennox diplomat 80MGF blower works for heat but not a/c
Posted 08 May 2011 - 07:58 PM
Posted 08 May 2011 - 08:28 PM
Note that when "W’ is energized, the blower is delayed 45 seconds.
If there is 120V to each motor tap but the blower does not operate, replace the motor.
If there is not 120V at the Motor when "Y", "G", or "W" is energized, replace the control.
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Posted 09 May 2011 - 11:43 AM
Electric heat uses one speed wide open.
So a way to switch speeds from low speed fan for gas heat to hi speed fan for air conditioning is done by use of a fan relay.
Older units use a relay, newer units use pc boards. Just thought I would throw that in.
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