76 Outdoor Unit
Test Run
Display Title Cause of Error
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Outdoor unit related error
HR unit related error
Voltage detection circuit of sub1 out-
door unit
Low/high voltage of sub2 outdoor unit
Voltage detection circuit of sub2 out-
door unit
Failure of operation mode conversion
Failure of Main constant speed com-
pressor operation
Failure of Sub1 constant speed com-
pressor1 operation
Failure of Sub1 constant speed com-
pressor2 operation
Failure of Sub2 constant speed com-
pressor1 operation
Failure of Sub2 constant speed com-
pressor2 operation
Failure of Sub3 constant speed com-
pressor1 operation
Failure of Sub3 constant speed com-
pressor2 operation
Automatic addressing of valves
Liquid pipe sensor of HR unit 1
Inlet sensor of subcooler of HR unit 1
Outlet sensor of subcooler of HR unit 1
Transmission error : HR unit 1 →
outdoor unit
Liquid pipe sensor of HR unit 2
Inlet sensor of subcooler of HR unit 2
Outlet sensor of subcooler of HR unit 2
Transmission error : HR unit 2 →
outdoor unit
Liquid pipe sensor of HR unit 3
Inlet sensor of subcooler of HR unit 3
Outlet sensor of subcooler of HR unit 3
Transmission error : HR unit 3 →
outdoor unit
Liquid pipe sensor of HR unit 4
Inlet sensor of subcooler of HR unit 4
Outlet sensor of subcooler of HR unit 4
Transmission error : HR unit 4 → out-
door unit
Liquid pipe sensor of HR unit 5
Inlet sensor of subcooler of HR unit 5
Outlet sensor of subcooler of HR unit 5
Transmission error: HR unit 5 → out-
door unit
Liquid pipe sensor of HR unit 6
Inlet sensor of subcooler of HR unit 6
Outlet sensor of subcooler of HR unit 6
Transmission error: HR unit 6 → out-
door unit
Liquid pipe sensor of HR unit 7
Voltage detection circuit of sub1 outdoor unit is out of order
Input voltage of sub2 outdoor unit is more than 487V or less
than 270V
Voltage detection circuit of sub2 outdoor unit is out of order
Pressure unbalance between outdoor units
Comp locking, Check Valve leakage, comp dielectric break-
down
Comp locking, Check Valve leakage, comp dielectric break-
down
Comp locking, Check Valve leakage, comp dielectric break-
down
Comp locking, Check Valve leakage, comp dielectric break-
down
Comp locking, Check Valve leakage, comp dielectric break-
down
Comp locking, Check Valve leakage, comp dielectric break-
down
Comp locking, Check Valve leakage, comp dielectric break-
down
Failure of automatic addressing of valves
Liquid pipe sensor of HR unit 1 is open or short
Inlet sensor of subcooler of HR unit 1 is open or short
Outlet sensor of subcooler of HR unit 1 is open or short
Failing to receive HR unit 1 signal at outdoor unit
Liquid pipe sensor of HR unit 2 is open or short
Inlet sensor of subcooler of HR unit 2 is open or short
Outlet sensor of subcooler of HR unit 2 is open or short
Failing to receive HR unit 2 signal at outdoor unit
Liquid pipe sensor of HR unit 3 is open or short
Inlet sensor of subcooler of HR unit 3 is open or short
Outlet sensor of subcooler of HR unit 3 is open or short
Failing to receive HR unit 3 signal at outdoor unit
Liquid pipe sensor of HR unit 4 is open or short
Inlet sensor of subcooler of HR unit 4 is open or short
Outlet sensor of subcooler of HR unit 4 is open or short
Failing to receive HR unit 4 signal at outdoor unit
Liquid pipe sensor of HR unit 5 is open or short
Inlet sensor of subcooler of HR unit 5 is open or short
Outlet sensor of subcooler of HR unit 5 is open or short
Failling to receive HR unit 5 signal at outdoor unit
Liquid pipe sensor of HR unit 6 is open or short
Inlet sensor of subcooler of HR unit 6 is open or short
Outlet sensor of subcooler of HR unit 6 is open or short
Failling to receive HR unit 6 signal at outdoor unit
Liquid pipe sensor of HR unit 7 is open or short
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