Low Pressure Drop Due To Refrigerant Shortage Or Electronic Expansion Valve Failure - Daikin E-Series Service Manual

SiAU18-715
7.26 Low Pressure Drop Due to Refrigerant Shortage or
Electronic Expansion Valve Failure
U0
Remote
Controller
Display
Applicable AII outdoor unit models
Models
Method of Short of gas malfunction is detected by discharge pipe temperature thermistor and low pressure
saturation temperature.
Malfunction
Detection
Malfunction Microcomputer judge and detect if the system is short of refrigerant.
★
Decision
Conditions
Supposed
Causes
Troubleshooting
Malfunction is not decided while the unit operation is continued.
Out of gas or refrigerant system clogging (incorrect piping)
Defect of pressure sensor
Defect of outdoor unit PCB (A1P)
Defect of thermistor R3T
Troubleshooting for Outdoor Unit
385