Carrier ClassiCool 53KDMT12N-718 - Page 86

82
SELF DIAGNOSTIC FUNCTION FOR MALFUNCTIONS DETECTION
The electronic printed circuit board in the outdoor unit is equipped with
smart self diagnostic.
When the system is on and in a malfunction, Leds Status of Printed Circuit Board will
refer to malfunction reason for easy fast service and maintenance.
Leds Status of Printed Circuit Board ( PCB ) of Side Discharge Outdoor Unit
Model 38KDMT12N-718
No.
Malfunction Reason
LED ( red )
1
Indoor and Outdoor communication malfunction
flash 5 times
2
Normal operation
on
Leds status of Printed Circuit Board ( PCB ) of Side Discharge Outdoor Units
Models 38KDMT18N-718 & 38KDMT24N-718 & 38KDMT30N-718
No.
Malfunction Reason
LED ( red )
1
Indoor and Outdoor communication malfunction
flash 5 times
2
Outdoor coil temperature sensor ( open or short circuit )
flash 2 times
3
Normal operation
on
Leds status of Printed Circuit Board ( PCB ) of Top Discharge Outdoor Unit
Model 38KDMT36N-718T
No.
Malfunction Reason
LED 2 ( green )
LED 3 ( yellow )
LED 4 ( red )
1
Normal operation
on
off
off
2
Stand by
off
on
off
3
Communication error
off
flash
flash
4
High pressure protection
flash
flash
off
5
Low pressure protection
flash
off
flash
Leds status of Printed Circuit Board ( PCB ) of Top Discharge Outdoor Units
Models 38KDHT42N-518T & 38KDHT48N-518T & 38KDHT60N-518T
No.
Malfunction Reason
LED 2 ( green )
LED 3 ( yellow )
LED 4 ( red )
1
Normal operation
on
off
off
2
Stand by
off
on
off
3
Default phase
off
off
flash
4
Phase sequence error
off
flash
off
5
Communication error
off
flash
flash
6
High pressure protection
flash
flash
off
7
Low pressure protection
flash
off
flash
8
Disconnect suction pipe sensor compressor
on
off
on
9
Outdoor temperature sensor
flash
off
off
10
Outdoor coil temperature sensor
off
off
on
11
Do not install plug CN2
off
off
flash
Error code status of Printed Circuit Board ( PCB ) of Top Discharge Outdoor Unit
Model 38KDHT72N-518T
No.
Malfunction Reason
Error Code
1
Phase reversal error or phase loss
E1
2
Power Error
E4
3
Outdoor coil temperature sensor ( open or short circuit )
E5
4
High pressure protection
P0
5
Low pressure protection
P1
6
Current Protection
P4
7
Outdoor coil temperature sensor ( Failure )
P6
8
COOL Run
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 wired room controller.