© 2024 Carrier. All rights reserved.
A Carrier Company
Edition Date: 09/24 Catalog No: 45MUAAQ-01OM
Replaces: New
45MUAA:Q Owner’s Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
20
ERROR CODES
Table 7 — Error Codes
If you receive one of the codes in Table 8, call a technician as soon as possible. Don’t panic...The unit will go into turbo mode until the error code is
cleared. A beeping noise will come from the unit, which is normal. For additional diagnostic information, refer to the Service Manual.
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 circuit 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 display will show DF in defrost mode and FC in forced cooling mode. DF and FC are not error codes.
Table 8 — Leak Detection Error Codes
EHC1 Refrigerant Sensor detects a leak
EHC2 Working condition of the refrigerant sensor is out of range and a leak is detected
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