Uo" Outdoor Unit: Low Pressure Drop Due To Refrigerant; Shortage Or Electronic Expansion Valve Failure - Daikin VRV III-S RXYMQ6PV4A Service Manual

SiME34-608
3.38 "UO " Outdoor Unit:

Shortage or Electronic Expansion Valve Failure

U0
Remote
Controller
Display
Applicable RXYMQ6P
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
Low Pressure Drop Due to Refrigerant
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 PC board (A1P)
Defect of thermistor R3T
Troubleshooting by Indication on the Remote Controller
171