Troubleshooting - Carrier 40MFC Installation Instructions Manual

For ease of service, the systems are equipped with diagnostic code
display LEDs on both the indoor and outdoor units. The outdoor
diagnostic display is two LEDs (Red and Green) 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
INDOOR UNIT DIAGNOSTIC GUIDES
Operation Lamp Timer Lamp
☆ 1 time
☆ 2 times
☆ 3 times
☆ 4 times
☆ 5 times
☆ 6 times
☆ 2 times
☆ 3 times
☆ 4 times
☆ 5 times
☆ 1 times
☆ 2 times
☆ 5 times
☆ = Flashing, X = Off
For additional diagnostic information, refer to the Service Manual
OUTDOOR UNIT DIAGNOSTIC GUIDES
Green LED Red LED
On X
X On
On On
On
☆
X
☆
On
☆
X
☆
☆ ☆
☆ = Flashing, X = Off
For additional diagnostic information, refer to the Service Manual

TROUBLESHOOTING

Display
X E0
X E1
X E2
X E3
X E4
X E5
On F1
On F2
On F3
On F4
P0
☆
P1
☆
☆ P4
Standby, normal
Operation, normal
High/Low voltage protection on compressor terminal
EEPROM error
Compressor's speed is out of control
Zero--- crossing signal detection error; lack of phase;
IGBT or Module protection
Communication error
the front of the unit. 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 the tables below.
Indoor unit EEPROM parameter error
Indoor / outdoor units communication error
Zero-crossing signal detection error
Indoor fan speed has been out of control
Indoor room temperature sensor is open circuit or short circuited
Evaporator coil temperature sensor is open circuit or short circuited
Outdoor temperature sensor is open circuit or short circuited
Condenser coil temperature sensor is open circuit or short circuited
Compressor discharge temperature sensor is open circuit or short circuited
Outdoor unit EEPROM parameter error
IPM malfunction or IGBT over-strong current protection
High or low voltage low voltage protection activated
Inverter compressor drive error
Failure Mode
synchronization error
13
Failure Mode