Indoor Fan Motor Anomaly - Mitsubishi Heavy Industries Hi-COP Series Service Manual

Error code
E16
Remote control:
–
7-segment display:
1. Applicable model
FDT, FDTC, FDTW, FDTS,
FDU, FDUM, FDK, FDUT71,
FDFW series only
2. Error detection method
Detected by revolution speed of
indoor fan motor.
3. Condition of error displayed
When actual revolution speed of
indoor fan motor drops to lower
than 200min for 30 seconds
-1
continuously, the compressor
and the indoor fan motor stop.
After 2-seconds delay, fan
motor starts again automatically,
but if this anomaly occurs 4
times within 60 minutes after
the initial detection.
4. Presumable cause

• Indoor fan motor anomaly

• Foreign matter at rotational
area of fan propeller
• Fan motor anomaly
• Dust on control PCB
• Blown fuse
• External noise, surge
Note:
LED Green Red
Keeps flashing 1-time flash
Indoor
Keeps flashing Stays OFF
Outdoor
5. Troubleshooting
Diagnosis
Does any
foreign matter intervene
in rotational area of fan
propeller?
NO
Does the fan
rotate smoothly when turned
by hand?
YES
Is DC280V
detected between �-�(�-�) of
fan motor connector
CNM?
YES
Is the fuse F3 (F4) or F202 blown?
Reset the power supply and restart.
Does it become normal?
96
–
Indoor fan motor anomaly
Content
(FDT, FDTC, FDTW, FDTS, FDU,
FDUM, FDK, FDUT71, FDFW series)
YES
NO
Note (1) �(�) is GND.
(2) Valve in ( ) are for the model
FDFW and FDK.
(1)(2)
NO
NO
YES
NO
YES
–
'14 • KX-SM-204
Countermeasure
Remove foreign matter.
Replace the fan motor.
Check power supply
voltage.
Replace fan motor and
power PCB.
Replace fan motor. (If
the anomaly persists after
replacing the fan motor,
replace the indoor control
PCB.)
Malfunction by temporary
noise.