*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.
*Note 2.
The system may go into the error mode on either the indoor unit or the outdoor unit side. In either case,
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.)
*Note 3. The outdoor unit operates according to the operation mode selection signal from the indoor unit.
Start
Breaker
turned on
Operation
command
Error stop
Error display on the
outdoor unit LED
Error command to
indoor unit
Operation
mode
Operation
mode
Error mode
72C ON
*Note 1
*Note 3
*Note 2
YES
YES
YES
YES
NO
NO
NO
NO
"HO" blinks in the room temperature
display window on the remote controller.
Operation command to indoor unit To [1].
Cooling / Heating
1. Protection function self-holding cancelled.
2. LEV1 fully closed.
Normal operation
1. 72C OFF
2. Inverter output 0Hz
3. Fan stop
4. All solenoid valves OFF
Refer to Cooling
Operation 2-(1)
Refer to
heating
Operation 2-(2).
2
From indoor unit
Error
Unit in the stopped state
Self-holding of
protection function
Indoor units
registered to the
remote controller
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