Hitachi — Fault Codes

41 codes

Set Free Sigma / IVX

02 — High pressure protection activated.
03 — Indoor/outdoor transmission abnormality
04 — Abnormal operation between inverter and control PCB.
05 — Power supply phase abnormality (open/reverse)
06 — Voltage drop due to excessively low or high voltage in the outdoor unit.
07 — Low temperature protection in heating (LP).
08 — High temperature protection in heating (HP).
11 — Indoor air thermistor fault.
12 — Outlet air thermistor (indoor unit) fault.
13 — Anti-freeze thermistor (indoor unit) fault.
14 — Heat exchanger (gas) pipe thermistor fault.
17 — Indoor EEPROM error.
19 — Protection device for the fan motor is triggered (indoor unit).
20 — Compressor thermistor fault (outdoor unit).
21 — Outdoor high pressure sensor fault.
22 — Outdoor air thermistor fault.
24 — Evaporation thermistor fault (outdoor unit).
31 — Indoor unit capacity combination error.
35 — Incorrect indoor unit number setting.
38 — Compressor discharge temperature too high.
41 — Cooling overload (possible activation of the high pressure device).
42 — Heating overload (high pressure device may be activated).
48 — Activation of overcurrent protection (inverter).
51 — Abnormality in the inverter current sensor.
53 — Activation of the transistor module protection device.
54 — Abnormality of the inverter fin (heat sink) temperature.
57 — Outdoor fan motor abnormality.
b0 — Incorrect setting of unit model.
b1 — Incorrect unit number setting.
b5 — Incorrect setting of indoor unit number for H-LINK type.
EE — Compressor protection alarm.

Set Free Sigma / IVX (FSXN)

01 — Activation of the indoor unit protection device (float switch)
0A — Abnormal transmission between outdoor units (H-LINK)
0C — Incorrect outdoor main unit address configuration
43 — Activation of the low compression ratio protection device
44 — Activation of the low pressure increase protection device
45 — Activation of the high-pressure increase protection device
47 — Vacuum operation protection / excessively low suction pressure
55 — Malfunction of the inverter PCB (PCB2) — abnormal output frequency
5A — Abnormal fan controller fin temperature
5B — Fan controller overcurrent protection