Carrier 42K - Unit Models; Unit Models - Export Heat Pump; Unit Models - Domestic Heat Pump

6
Key Features (Cont.)
The electronic printed circuit board in the indoor unit is equipped with
smart self diagnostic function which automatically stops the operation of
the air conditioner in case of a malfunction.
Leds Status and Error Code on the display panel of indoor unit ( all sizes ) refer to
malfunction reason for easy fast service and maintenance.
Malfunction
Reason
LED
OPERATION
LED
TIMER
LED
DEF/FAN
LED
ALARM
Malfunction
Code
Indoor air temperature sensor malfunction
E2
Indoor coil temperature sensor malfunction
E3
Outdoor coil temperature sensor
malfunction
E4
Outdoor unit malfunction
E6
EEPROM malfunction
E7
Pump temperature sensor malfunction
( option )
E5
Water-level alarm malfunction
E8
Refrigerant leak
X X EC
= Light = Flash at 5Hz = OFF
Leds status on the PCB of outdoor unit only sizes 36K – 42K – 48K and 60K ( 3Ph ) refers to malfunction reason
Protection function operates if a malfunction happens in the outdoor unit as below by leds of PCB of outdoor unit as follows:
Malfunction Reason LED 1 LED 2 LED 3
No defect off off on
Phase reversal on off on
Overload of current off on on
Phase loss on on on
NOTES
1- Prior to the malfunction repair, disconnect the electrical mains supply by moving the circuit breaker to OFF position.
2- After repairing the malfunction, connect the electrical main supply by moving the circuit breaker to ON position
and operate the air conditioner by using the wireless remote control or using wired room controller.