Lennox Mini-Split Service Manual / Page 203
E3 Flow Chart
Indoor fan speed error
Power off, then restart the unit 2 minutes
later. Does error still display?
No
Shut off power supply and rotate fan by
hand. Does fan spin freely?
Yes
The unit operates normally.
Check the wiring of the fan motor. Is it
connected correctly?
Yes
Measure the voltage for the fan motor
from the main PCB. Is the voltage cor-
rect?
Yes
Replace the electric control box.
Yes
No
Remove obstruction.
No
Correct the connections.
No
Replace the main PCB
Yes
Replace the fan motor
No
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