Mitsubishi Electric PUZ-M200YKA Service Manual page 49

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
OCH737
Diagnosis flow
2 minutes
or less
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
• "Please Wait"
will be displayed
during the startup
diagnosis after turning
on the main power.
NO
Heat Standby
• 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
49
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
communication errors,
the display of remote
controller may not
match the LED display of
the outdoor unit.