2.41 "Uo" Outdoor Unit; Uo" Outdoor Unit: Low Pressure Drop Due To Refrigerant Shortage Or Electronic Expansion Valve Failure - Daikin RXYQ72 Serivce Manual

Troubleshooting by Indication on the Remote Controller

2.41 "UO" Outdoor Unit:

Shortage or Electronic Expansion Valve Failure
U0
Remote
Controller
Display
Applicable RXYQ72M, 96M
Models
Method of Short of gas malfunction is detected by discharge pipe temperature thermistor.
Malfunction
Detection
Malfunction Microcomputer judge and detect if the system is short of refrigerant.
★
Decision
Conditions
Supposed
Causes
172
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 R2T or R4T
SiUS39-601
Troubleshooting