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Fan Check Flow Chart
Fan connect
fault on UIM
Check
connection at
CN207
Good
Reconnect
on CN207
Replace fan
motor assembly
Bad
Fault
cleared?
Done
Yes
No
Check
resistance
on fan cable
connector pin
1 to 3
Good
49-61Ω
Bad
˃100Ω
Is
case
of motor
hot?
No
Yes
Thermal switch
may be open;
allow to cool
Check
resistance
of cold
motor
Bad
˃100Ω
Good
49-61Ω
Reconnect
cable to CN207
Replace control
board
Check air
fi lter; clean if
needed
Apply power to
the unit
Fault
cleared?
Yes
No
Done
Call tech
services