Day and Night Air Conditioner Error Codes

AC BrandsDay & Night

R-410A Ductless Split System Air Conditioner and Heat Pump MODELS: DLC4(A/H)-Outdoor, DLF4(A/H)-Indoor SIZES: 9K, 12K, 18K, 24K, 30K, and 36K.

The unit has onboard diagnostics. Error codes will appear on the LED display on the front panel of the indoor unit in place of the temperature display. Error codes are also displayed on the outdoor unit microprocessor board with colored LED lights. The tables explain the error codes for the specific models.

Day and Night Air Conditioner Error Codes
Day and Night Air Conditioner Error Codes
Error CodeProblem
E1High pressure protection
E2Stop for anti?freeze protection of indoor ?unit
E4Stop for discharge temp protection
E5Stop for low voltage protection
E6Stop for communication malfunction
H1Automatic defrosting
H3Stop for compressor overload protection
H4Overload protection
H5Stop for IPM module protection
H6DC motor (indoor unit) does not operate
HCPFC overcurrent malfunction
F1Indoor ambient temperature sensor malfunction
F2Indoor tube temperature sensor malfunction
F3Outdoor ambient temperature sensor malfunction
F4Outdoor tube temperature sensor malfunction
F5Outdoor discharge temperature sensor malfunction
PHDC voltage is too high
PLLow voltage protection
L9High power protection
LPUnit match protection
U8Indoor fan speed detection circuit malfunction
U9System current too high
C5Jumper connection malfunction protection

Overload protection

If temperature sensed by the overload sensor is over 239°F, the compressor will stop and the outdoor fan will stop with a time lag of 30 seconds. If the temperature drops below 203°F, the overload protection will be reset.

If voltage on the DC bus is below 150V or over 420V, the compressor will stop and the outdoor fan will stop with a time lag of 30 seconds. When voltage on the DC bus returns to its normal value and the compressor has stayed at a stop for at least 3 minutes, the compressor will resume its operation. Faults of temperature sensors.

Day and Night Air Conditioner Remote Control
Day and Night Air Conditioner Remote Control

Description of Sensors: Indoor Ambient Temperature

Faults: The sensor is open or short−circuited for 30 consecutive seconds

Description of Sensors: Indoor Tube Temperature

Faults: The sensor is open or short−circuited for 30 consecutive seconds

Description of Sensors: Outdoor Ambient Temperature

Faults: The sensor is open or short−circuited for 30 consecutive seconds

Description of Sensors: Outdoor Tube Temperature

Faults: The sensor is open or short−circuited for 30 consecutive seconds, and no detection is performed within 10 minutes after defrost begins

Description of Sensors: Exhaust

Faults: After the compressor has run for 3 minutes, the sensor is open or short−circuited for 30 consecutive seconds

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