Mitsubishi Electric PUHZ-FRP71VHA Service Manual page 40

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 error codes
displayed on the LED?
NO
OCH544
Diagnosis flow
How long is "PLEASE WAIT"
kept being displayed on the
remote controller?
2 to 6
minutes
Are any error codes
displayed on the
remote controller?
YES
YES
2 minutes
or less
• "PLEASE WAIT"
will be displayed
during the start-up
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
40
Inspection method and
Cause
troubleshooting
• Normal.
The start-up diagnosis will
be over in around 2 minutes.
• Refer to "Self-diagnosis
action table" in order to
solve the trouble.
• In case of communication
errors, the display of
remote controller may not
match the LED display of
the outdoor unit.