Mitsubishi Electric PU(H)Y-P250YGM-A Service Handbook page 102

(2) Outdoor unit (cooling and heating modes)
"HO" blinks
on the remote controller
1. Protection function
self-holding cancelled.
2. Indoor unit LEV fully closed.
1. 52C OFF
2. Inverter output 0Hz
3. Fan stop(outdoor unit only)
4. All solenoid valves OFF
Refer to 2-(1)
Cooling operation.
*Note 1. For about 1 minutes after power on, search for the indoor unit address, for the remote controller address,
and for the group information will start. During this, "HO" blinks on the display of the remote controller.
*Note 2. The error mode includes that of indoor units and outdoor units. When the unit goes into the error mode,
both the indoor and the outdoor units make an error stop.
(The units do not stop during the emergency operation.)
*Note 3. The units will follow the operation mode commands from the indoor unit.
Start
Breaker NO
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 only, Heating only
*Note 2
YES
Error mode
NO
52C ON
*Note 3
Operation
mode
Refer to 2-(2)
Heating operation.
Operation command to indoor unit (to [1] )
- 93 -
[ VII Control ]
Normal operation
Error
Unit in the stopped state
Error stop
Error display on
the outdoor unit LED
Self-holding of
protection function
Operation command
to the indoor unit