38MARB: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
25
INDOOR UNIT DIAGNOSTIC GUIDES
Table 13 — Indoor Unit Diagnostic Guide
O (light) X (off) (flash)
NOTES:
PC03
3. 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 28
3 times X EH 02 Zero-crossing signal detection error Page 30
4 times X EH 03 The indoor fan speed is operating outside of the normal control Page 31
5 times X EC 51 Outdoor unit EEPROM parameter error Page 27
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 35
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 34
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 32
9 times X EH 06 Indoor PCB/Display board communication error Page 37
8 times X EL 0C Refrigerant leakage detection Page 36
7 times PC 00 IPM malfunction or IGBT over-strong current protection Page 39
2 times PC 01 Over voltage or over low voltage protection Page 42
3 times PC 02
Top temperature protection of the compressor or high temperature protection of the
IPM module or high pressure protection
Page 43
5 times PC 04 Inverter compressor drive error Page 45
1 time PC 08 Current overload protection Page 38
6 times PC 40 Communication error between the outdoor main chip and the compressor driven chip Page 48
7 times PC 03 Low pressure protection Page 46
1 time O -- Indoor units mode conflict (match with multi outdoor unit) --
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