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(2) BC controller
Note : 1 Two error modes include indoor unit side trouble, BC controller trouble, and outdoor unit side trouble. In the case of indoor
unit side trouble, error stop is observed in the concerned indoor unit only, and in the cases of BC controller and outdoor unit
side troubles, error stop is observed in all the indoor units, BC controller, and outdoor unit.
YES
NO
YES
NO
YES
NO
Normal operations
Trouble observed
Stop
Solenoid valve OFF,
LEV fully closed.
Start
Breaker
turned on
Operation
command
1.Operation mode judgement
(cooling-only, heating-only,
cooling/heating mixed)
2.Transmission to outdoor unit
Receiving operation mode
command from outdoor unit
Error mode
Cooling-only
operations
Heating-only
operations
Cooling-main
operations
Heating-main
operations
Operation mode
Operation mode
Operation mode
Cooling/heating mixed
Note : 1
Fan
Error stop
Error code blinks on the
outdoor controller board
Error command to
BC controller
Error code blinks on the
remote controller