40MAHB-01SI Specifications subject to change without notice. 19
TROUBLESHOOTING
For ease of service, the systems are equipped with diagnostic code display LEDs on both the indoor and outdoor units. The indoor
diagnostic display is a combination of flashing LEDs on the display panel or the front of the unit.
Some indoor units display error codes specifying failure modes in the outdoor units. If possible, always check the diagnostic codes displayed on
the indoor unit first.
The diagnostic codes displayed in the indoor and outdoor units are listed in Table 9.
INDOOR UNIT DIAGNOSTIC GUIDES
Table 9 — Indoor Unit Diagnostic Codes
O (on − light) X (off − light) ☆(flash)
For additional diagnostic information, refer to the service manual.
OPERATION LAMP (TIMES) TIMER LAMP DISPLAY ERROR INFORMATION
☆1 OFF EH 00/EH 0A Indoor unit EEPROM parameter error
☆2 OFF EL 01 Indoor/outdoor unit communication error
☆3 OFF EH 02 Zero-crossing signal detection error
☆4 OFF EH 03 Indoor fan operating outside of the normal range
☆5 OFF EC 51 Outdoor unit EEPROM parameter error
☆5 OFF EC 52 T3 is in open circuit or has short circuited
☆5 OFF EC 53 T4 is in open circuit or has short circuited
☆5 OFF EC 54 TP is in open circuit or has short circuited
☆5 OFF EC 56 T2B is in open circuit or has short circuited
☆6 OFF EH 60 T1 is in open circuit or has short circuited
☆6 OFF EH 61 T2 is in open circuit or has short circuited
☆12 OFF EC 07 Outdoor fan operating outside of the normal range
☆9 OFF EH 0b Indoor PCB/Display board communication error
☆8 OFF EL 0C Refrigerant leakage detection
☆7 FLASH PC 00 IPM malfunction or IGBT OSCP
☆2 FLASH PC 01 Over voltage or over low voltage protection
☆3 FLASH PC 02 Compressor or IPM high temp/pressure protection
☆5 FLASH PC 04 Inverter compressor drive error
☆1 FLASH PC 08 Current overload protection
☆6 FLASH PC 40 Communication error between outdoor chip and compressor chip
☆7 FLASH PC 03 Low pressure protection
☆1 ON -- Indoor unit mode conflict
☆9 OFF EH b1 Indoor board and Multi-function communication error
☆11 OFF FH 0d Ionizer malfunction
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