SG-38MARB-01 Specifications subject to change without notice. 31
INDOOR UNIT DIAGNOSTIC GUIDES
Table 18 — Indoor Unit Diagnostic Guide
O(light) X(off) (flash)
NOTES:
P3
1. In the HEATING mode, when the outdoor temperature is lower than -25 °C for one hour, the indoor unit displays the error code P3. If the
outdoor temperature is higher than -22°C for 10 minutes and the compressor stops for 1 hour or the outdoor temperature is higher than -5°C for
10 minutes, the unit will start.
P6
2. Low pressure protection switch is open. Check the switch and repair or leak check the unit and recharge.
Troubleshooting
Use the remote controller. If the unit does not respond to the remote, the indoor PCB needs to be replaced; if the unit does respond, then the
display board needs to be replaced.
OPERATION LAMP TIMER LAMP DISPLAY LED STATUS SOLUTION
1 time X
EH 00/
EH 0A
Indoor unit EEPROM parameter error --
2 times X EL 01 Indoor / outdoor units communication error Page 34
3 times X EH 02 Zero-crossing signal detection error Page 36
4 times X EH 03 The indoor fan speed is operating outside of the normal control Page 37
5 times X EC 51 Outdoor unit EEPROM parameter error Page 33
5 times X EC 52 Condenser coil temperature sensor T3 is an open circuit or has short circuited --
5 times X EC 53 Outdoor room temperature sensor T4 is an open circuit or has short circuited Page 42
5 times X EC 54
Compressor discharge temperature sensor TP is an open circuit or has short
circuited
--
5 times X EC 56
Evaporator coil outlet temperature sensor T2B is an open circuit or has short
circuited (for free-match indoor units)
--
6 times X EH 60 Indoor room temperature sensor T1 is an open circuit or has short circuited Page 41
6 times X EH 61
Evaporator coil middle temperature sensor T2 is an open circuit or has short
circuited
--
12 times X EC 07 The outdoor fan speed is operating outside of the normal range Page 39
9 times X EH 06 Indoor PCB/Display board communication error Page 44
8 times X EL 0C Refrigerant leakage detection Page 43
7 times PC 00 IPM malfunction or IGBT over-strong current protection Page 46
2 times PC 01 Over voltage or over low voltage protection Page 49
3 times PC 02
Top temperature protection of the compressor or high temperature protection of
the IPM module or high pressure protection
Page 50
5 times PC 04 Inverter compressor drive error Page 52
1 time PC 08 Current overload protection Page 45
6 times PC 40
Communication error between the outdoor main chip and the compressor driven
chip
Page 55
7 times PC 03 Low pressure protection Page 53
1 time O -- Indoor units mode conflict (match with multi outdoor unit) --
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