Daikin Super Multi Plus E-Series - Low Pressure Drop Due to Refrigerant Shortage or Electronic Expansion Valve Failure

SiEN18-622 Troubleshooting for Outdoor Unit
Troubleshooting 387
7.26 Low Pressure Drop Due to Refrigerant Shortage or
Electronic Expansion Valve Failure
Remote Control
Display
U0
Applicable
Models
AII outdoor unit models
Method of
Malfunction
Detection
Short of gas malfunction is detected by discharge pipe temperature thermistor and low pressure
saturation temperature.
Malfunction
Decision
Conditions
Microcomputer judge and detect if the system is short of refrigerant.
HMalfunction is not decided while the unit operation is continued.
Supposed
Causes
 Out of gas or refrigerant system clogging (incorrect piping)
 Defect of pressure sensor
 Defect of outdoor unit PCB (A1P)
 Defect of thermistor R3T