Method of
The rotation speed detected by the Hall IC during fan motor operation is used to determine
Malfunction
abnormal fan motor operation
Detection
Malfunction
when the detected rotation feedback singal don’t receiced in 2 minutes
Decision
Conditions
Supports curses
Detection error due to faulty indoor unit PCB
How to check Fan Motor (DC)
1. Check connector connection.
2. Check motor power supply voltage output (pins 1-4).
3. Check motor control voltage (pins 4-5).
4. Check rotation command voltage output (pins 4-6).
5. Check rotation pulse input (pins 4-7).
Notes:the a/c is electrifying,don’t pull out or insert the terminals of the
motor,else the motor would be damaged
Troubleshooting
* Caution
Be sure to turn off power switch before connect or disconnect connector,
or else parts damage may be occurred.
Turn off power supply and
rotate fan by hand
HSU12/18VHJ(DB)
Functions and control
57
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