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Troubleshooting 18,000 & 24,000 Units
Indoor fan does not operate
Energize the unit
Is the feedback
terminal PG motor
loose?
End Troubleshooting
Yes
No
Repair connections
Yes
Is the control terminal
of PG motor loose?
Re-energize unit to turn unit on.
Measure within one minute after the
louvers are opened whether the output
voltage on the control terminal of the
PG motor is > 50 volts
Replace indoor board
No
Possible causes:
1. Fan motor locked
2. The control or feedback terminal of PG not connected properly
3. Damaged motor
4. Main board malfunction
Replace indoor
motor
Yes
Does fan turn freely?
Find obstruction
OK
OK
Repair connections
Yes
OK
