Mitsubishi Electric PUHY-P250YNW-A Service Handbook page 114

[5-4 Operation Flow Chart ]
(2) Outdoor unit (cooling mode)
"HO" blinks in the room temperature
display window on the remote controller.
1. Protection function self-holding cancelled.
2. LEV1 fully closed.
1. 72C OFF
2. Inverter output 0Hz
3. Fan stop
4. All solenoid valves OFF
*Note 1. For approximately one minute after power on, a search for the indoor unit address, remote controller address, and group
information is performed. While this process is performed, "HO" blinks on the display.
The system may go into the error mode on either the indoor unit or the outdoor unit side. In either case,
*Note 2.
the connected indoor and outdoor units will come to an error stop. (If the units go into the backup mode,
they will remain in operation.)
The outdoor unit operates according to the operation mode selection signal from the indoor unit.
*Note 3.
BS_05_C
Start
NO
Breaker
turned on
YES
*Note 1
Indoor units
registered to the
remote controller
NO
YES
2
From indoor unit
NO
Operation
command
YES
Operation
mode
Cooling
*Note 2
YES
Error mode
NO
72C ON
*Note 3
Operation
mode
Refer to Cooling
Operation 2-(1)
Operation command to indoor unit (to
Normal operation
Error
Unit in the stopped state
Error stop
Error display on the
outdoor unit LED
Self-holding of
protection function
Error command to
indoor unit
)
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chapter 5 -