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Indoor Fan Motor
The indoor fan motor is a DC motor driven by the
main board and provides feedback to the main
board for proper speed confirmation.
Indoor Fan Diagnosing
Fan voltages cannot be checked due to the high
DC output. If a fan motor were to fail, there is a
possibility the fan motor could short out the main
control board.
Check for Fault Codes
Check fault codes by pressing and holding
MODE and then press AUX. Verify whether F1
(Inside fan fault) code is active. Record any other
faults and clear the codes by pressing AUX.
Verify Fan Operation
Enter Service Mode by pressing and holding
+ and - buttons. On entry, the display lights
all LED's. Press MODE until IF is shown in
the display. Pressing + turns the fan on and
pressing - will turn the fan off. AUX key exits
Service Mode.
Verify Fan Resistance Value
Approximate fan resistance values can be
checked from the main control board at the J103
connector.
• Pin 6 (red) to pin 4 (black): 12.56 Ohms + or
- 15%.
Model Name
Winding Resistance (ohm)
Indoor Motor
Red to Black
All Models
12.56Ω ± 15%
Air Flow
Verify No Motor Binding
Disconnect power and check for binding or a
foreign object restricting the blade movement if
the indoor fan is not running.
Verify Outdoor Fan Motor Is Not Causing The
Indoor Fan Motor Not To Run
• If the indoor motor is not running, unplug the
outdoor motor connector. Restore power
and if the indoor motor runs with the outdoor
motor unplugged, then replace the outdoor
fan motor.
• If the indoor fan motor will still not run, replace
both fan motors and main control.
Indoor Fan Removal
1. Remove main control board cover and
junction box cover. All screws are 5/16-in.
screws.
Main Control
Board Cover
– 34 –
Junction Box
Cover
(Continued next page)
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