Mitsubishi Electric PUZ-HWM140VHA Service Manual page 30

Symptoms: "Please Wait" is kept being displayed on the remote controller.
Check the display time of "Please Wait"
after turning on the main power.
6 minutes
or more
Check the LED display of the
outdoor controller circuit board.
Are any check codes
displayed on the LED?
NO
OCH748
Diagnosis flow
How long is
"Please Wait"
kept being displayed on
the remote controller?
2 to 6
minutes
Are any check codes
displayed on the
remote controller?
YES
YES
Cause
2 minutes
or less
• "Please Wait"
will be displayed
during the startup
diagnosis after turning
on the main power.
NO
• Miswiring of indoor/
outdoor connecting
wire
• Breaking of indoor/
outdoor connecting
wire (S3)
• Defective indoor
controller board
• Defective outdoor
controller circuit
board
• Defective indoor
controller board
• Defective remote
controller
30
Inspection method and
troubleshooting
• Normal.
The startup diagnosis will
be over in around 2 minutes.
• Refer to "Self-diagnosis
action table" in order to
solve the trouble.
• In the case of communi-
cation errors, the display
of remote controller may
not match the LED display
of the outdoor unit.