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(2) Outdoor unit (Cooling only, heating only, cooling main, heating main operations)
"HO" blinks on the remote controller
1. Protection function self-
holding cancelled
2. LEV1 fully closed
1. 52C1 OFF
2. Inverter output 0Hz
3. Outdoor fan Stop
4. All solenoid valve OFF
Cooling/dry operation
Refer to 2-(1), 2-(3)
Notes :
❉1 For about 3 minutes after turning on power source, address and group information of outdoor unit, indoor unit, and remote
controller are retrieved by remote controller, during which "HO" blinks on and off on remote controller. In case indoor unit is not
grouped to remote controller, "HO" display on remote controller continues blinking even after 3 minutes after turning on power
source.
❉2 Two trouble modes include indoor unit side trouble, and outdoor unit side trouble. In the case of indoor unit side trouble, error
stop is observed in outdoor unit only when all the indoor units are in trouble. However, if one or more indoor units are operating
normally, outdoor unit shows only LED display without undergoing stop.
❉3 The operation mode is determined by the BC controller.
❉4 When the BC controller sends a signal indicating that there is a combination of units in heating and cooling modes, the
operation mode (cooling main or heating main) is determined by the outdoor unit.
Start
NO
Breaker
turned on
YES
Note: ❉1
Set indoor
address No. to remote
controller
NO
YES
2
NO
Operation
command
YES
Operation
mode
Cooling-only, Heating-only,
Cooling/heating mixed
Note: ❉2
YES
Error mode
NO
52C1 ON
❉3
Note:
Combination of cooling/
heating operation
Operation
mode
Operation
Heating operation
Cooling main
operation
Refer to 2-(2)
Relaying of operation mode information to the BC controller
- 103 -
From outdoor unit
Note: ❉4
mode
Heating main
operation
Normal operation
Trouble observed
Stop
Error stop
Outdoor unit LED error display
Protection function self-holding
Error command to indoor unit
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Troubleshooting
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