Daikin 4MXS36NMVJU Service Manual

SiUS121630EA Troubleshooting for Outdoor Unit
Service Diagnosis 161
7. Troubleshooting for Outdoor Unit
7.1 Refrigerant Shortage
Error Code
U0
Outdoor Unit LED
Display
A
j
1
h
2
h
3
i
4
i
5
h
Method of Error
Detection
Refrigerant shortage is detected by checking the input current value and the compressor running
frequency. If there is insufficient refrigerant, the input current tends to be lower than the normal
value.
Error Decision
Conditions
The following conditions continue for 7 minutes.

Input current
≤
A × output frequency + B

Output frequency > C

If the error repeats, the system is shut down.

Reset condition: Continuous run for about 60 minutes without any other error
Supposed
Causes

Disconnection of the discharge pipe thermistor, indoor or outdoor heat exchanger thermistor,
room or outdoor temperature thermistor

Closed stop valve

Refrigerant shortage (refrigerant leakage)

Poor compression performance of compressor

Defective electronic expansion valve
A
(–)
B (A) C (Hz)
18 class 10/1000 0.3 54
24/36 class 27/1000 2 40

Daikin 4MXS36NMVJU Specifications

General

Model	4MXS36NMVJU
Category	Air Conditioner
Heating Seasonal Performance Factor (HSPF)	4.0
Number of Connectable Indoor Units	4
Seasonal Energy Efficiency Ratio (SEER)	6.0
Refrigerant	R32
Indoor Units Compatibility	Compatible with various indoor units
Indoor Unit Dimensions (HxWxD)	Varies by model
Indoor Unit Weight	Varies depending on the connected indoor unit model
Operating Temperature (Cooling)	-10 to 46 °C
Operating Temperature (Heating)	-15 to 24 °C
Type	Multi-Split System