Mitsubishi Electric PKA-RP1.6GAL Service Technical Manual page 98

Symptoms: "HO" is kept being displayed on the remote controller.
Check the display time of "H0"
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
Diagnosis flow
2 minutes
How long is "H0"
or less
kept being displayed on the
remote controller?
2 to 6
minutes
Are any error codes
displayed on the
remote controller?
YES
YES
Cause
• "H0" will be displayed
during the start-up
diagnosis after turning
on the main power.
NO
• Mis-wiring 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
98
Inspection method and
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.