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16
TROUBLESHOOTING
For ease of service, the systems are equipped with diagnostic code
display LEDs on both the indoor and outdoor units. The outdoor
diagnostic display consists of two LEDs (Red and Green) on the
outdoor unit board and is limited to a few errors.
The indoor diagnostic display is a combination of flashing LEDs
on the display panel or the front of the unit. If possible, always
check the diagnostic codes displayed on the indoor unit first.
The diagnostic codes displayed on the indoor unit are listed in
Table 8.
INDOOR UNIT DIAGNOSTIC GUIDES
Table 8—Indoor Unit Diagnostic Guides
OPERATION LAMP TIMER LAMP DISPLAY LED STATUS
☆1 time
X E0 Indoor unit EEPROM error
☆ 2 times X E1 Communication malfunction between indoor and outdoor units
☆4 times X E3 Indoor fan speed has been out of control
☆5 times X E4 Indoor room temperature sensor T1 open circuit or short circuit
☆6 times X E5 Evaporator coil temperature sensor T2 open circuit or short circuit
☆7 times X EC Refrigerant leakage detection
☆8 times X EE Water-level alarm malfunction
☆1 time O F0 Current overload protection
☆2 times O F1 Open circuit or short circuit of outdoor ambient temperature sensor T4
☆3 times O F2 Open circuit or short circuit of condenser coil temperature sensor T3
☆4 times O F3 Open circuit or short circuit of Compressor discharge temperature sensor T5
☆5 times O F4 Outdoor unit EEPROM error
☆6 times O F5 Outdoor fan speed has been out of control
☆7 times O F6 T2B sensor error
☆8 times O F7 Lifting-panel communication error
☆9 times O F8 Lifting-panel malfunction
☆10 times O F9 Lifting-panel is not closed
☆1 time ☆ P0 IPM malfunction
☆2 times ☆ P1 Over voltage or over low voltage protection
☆3 times ☆ P2 High temperature protection of compressor top
☆4 times ☆ P3 Outdoor low temperature protection
☆5 times ☆ P4 Inverter compressor drive error
☆6 times ☆ P5 Mode conflict
☆7 times ☆ P6 Compressor low-pressure protection
☆8 times ☆ P7 Outdoor IGBT temperature sensor error
O (light) X (off) ☆ (flash)
For additional diagnostic information, refer to the Service Manual.
Copyright 2016 Carrier Corporation S 7310 W. Morris St. S Indianapolis, IN 46231
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No: 40MBC-03SI
Replaces: 40MBC-38MAQ-02SI
Edition Date: 08/16