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7. HYDRO UNIT INSTALLATION MANUAL
Engineering Data Book
7
Alarm
indication
Main failure part Description
F04
Outdoor unit discharge
temperature sensor TD defect
When open- or short-circuit of discharge temperature sensor TD is
detected
F06
Outdoor unit temperature sensor
TE or TS defect
When open- or short-circuit of heat exchanger temperature sensor TE or
TS is detected
F08
Outdoor unit outside air
temperature sensor TO defect
When open- or short-circuit of outside air temperature sensor TO is
detected
H01 Compressor breakdown
When min-Hz is reached by current release control or when short-circuit
current (Idc) is detected after direct current excitation
H02 Compressor locked When compressor lock is detected
H03 Current detector defect When abnormal current is detected in AC-CT or phase loss is detected
H06 Low-pressure system defect Ps pressure sensor defect or low-pressure protective operation
L29 Other outdoor unit faults
Other outdoor unit faults: 1) Inter-MCU communication error between IPDU
and CDB 2) abnormal GBT heatsink temperature
L31 Phase sequence error, etc.
When phase sequence of 3-phase power supply is incorrect (thermostat
OFF operation continued), etc.
P03
Abnormal outdoor unit discharge
temperature
When abnormal temperature is detected by discharge temperature release
control
P04 High-pressure system defect
When high-pressure switch, IOL is activated or when abnormality is
detected by high-pressure release control by TE
P22 Outdoor unit fan defect When overcurrent or lock in outdoor unit fan drive circuit is detected
P26 Inverter Idc operation
When short-circuit protection is activated for compressor driver devices
(G-Tr, IGBT)
P29 Position detection error When compressor motor position detection error is detected
42-EN
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