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

SiENBE18-621
7.26 Low Pressure Drop Due to Refrigerant Shortage or
Electronic Expansion Valve Failure
U0
Remote Control
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.
HMalfunction is not decided while the unit operation is continued.
Decision
Conditions
" Out of gas or refrigerant system clogging (incorrect piping)
Supposed
" Defect of pressure sensor
Causes
" Defect of outdoor unit PCB (A1P)
" Defect of thermistor R3T
Troubleshooting
Troubleshooting for Outdoor Unit
335