Carrier 40MPHA Service Manual page 16

TROUBLESHOOTING (CONT)
Error Display (Indoor Unit)
When the indoor unit encounters a recognized error, the indicator light flashes in a corresponding series, the timer display may turn on or
begin flashing, and an error code displays. These error codes are described in Table 10.
Display
E0/EA Indoor unit EEPROM parameter error
E1 Indoor / outdoor units communication error
E3 The indoor fan speed is operating outside of the normal range
E4 Indoor room temperature sensor T1 is in open circuit or has short circuited
E5 Evaporator coil temperature sensor T2 is in open circuit or has short circuited
EB Communication error between the indoor PCB and display board
EF Intelligent eye module error
F0 Overload current protection
F1 Outdoor ambient temperature sensor T4 open circuit or short circuit
F2 Condenser coil temperature sensor T3 is in open circuit or has short circuited
F3 Compressor discharge temperature sensor TP open circuit or short circuit
F4 Outdoor unit EEPROM parameter error
F5 The outdoor fan speed is operating outside of the normal range
P0 IPM malfunction or IGBT over-strong current protection
P1 Over voltage or over low voltage protection
P2 High temperature protection of IPM module
P4 Inverter compressor drive error
For other codes
The display board may show a garbled code or a code undefined by the service manual. Ensure that this code is not a temperature reading.
Troubleshooting
Test the indoor unit using the remote controller. If the unit display is working however will not respond to the remote, the indoor PCB
requires replacement. If there is no display after pressing the "LED" button and the unit responds, the display board requires replacement.
Table 10—Error Codes
Error Information
16
Solution
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