37MGHAQ: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
36
ERROR CODES
For ease of service, the systems are equipped with diagnostic code
display LEDs on both the indoor and outdoor units. The outdoor
diagnostic display has one red LED on the outdoor unit board and is
limited to very few errors. The indoor diagnostic display is a combination
of flashing LEDs on the display panel or the front of the unit.
There may be a few error codes displayed in the indoor unit that might
relate to the outdoor unit’s problems. If possible, always check the
diagnostic codes displayed on the indoor unit first.
Table 20 — Error Codes
DISPLAY MALFUNCTION AND PROTECTION INDICATION
EC07 ODU fan speed out of control
EC0d ODU malfunction
EC51 ODU EEPROM parameter error
EC52 ODU coil temp sensor error
EC53 ODU ambient temp sensor error
EC54 COMP. discharge temp sensor error
EC56 IDU coil outlet temp sensor error
ECC1 Other IDU refrigerant sensor detects leakage (multi-zone)
EH00 IDU EEPROM malfunction
EH03 IDU fan speed out of control
EH0A IDU EEPROM parameter error
EH0b IDU main control and display boards communication error
EH0E Water-level alarm malfunction
EH3A External fan DC bus voltage is too low protection
EH3b External fan DC bus voltage is too high fault
EH60 IDU room temp. sensor (T1) error
EH61 IDU coil temp. sensor (T2) error
EH62/
EH66
Evap coil inlet temp sensor (T2B) open circuit or short circuit
EH65 Evap coil inlet temp. sensor (T2A) open ciruit or short circuit
EHbA
Communication error between indoor unit and external fan
module
EHb3 Communication error between wire and master control
EHC1 Refrigerant sensor detects leakage
EHC2 Refrigerant sensor is out of range and leakage is detected
EHC3 Refrigerant sensor is out of range
EL01 IDU & ODU communication error
EL0C System lacks refrigerant
EL16
Communication malfunction between adapter board and
outdoor main board
FHCC Refrigerant sensor error
FL09 Mismatch between the new and old platforms
PC00 ODU IPM module protection
PC01 ODU voltage protection
PC02 Compressor top (or IPM) temp. protection
PC03 Pressure protection (low or high pressure)
PC04 Inverter compressor drive error
PC0L Low ambient temp. protection
---- IDUs mode conflict
NOTE: The digital tube will show DF in defrost mode and FC in forced
cooling mode. DF and FC are not error codes.
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