Uo" Outdoor Unit: Low Pressure Drop Due To Refrigerant Shortage Or Electronic Expansion Valve Failure - Daikin VRVIII-S Service Manual

Troubleshooting by Indication on the remote control
3.37 "UO " Outdoor Unit: Low Pressure Drop Due to Refrigerant
Shortage or Electronic Expansion Valve Failure
U0
remote control
Display
Applicable
RXYSQ4~6P
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 HMalfunction is not decided while the unit operation is continued.
Conditions
Supposed ! Out of gas or refrigerant system clogging (incorrect piping)
! Defect of pressure sensor
Causes
! Defect of outdoor unit PC board (A1P)
! Defect of thermistor R3T
164
SiENBE34-703
Troubleshooting