U0" Outdoor Unit: Low Pressure Drop Due To Refrigerant Shortage Or Electronic Expansion Valve Failure - Daikin FCQ18PVJU Service Manual

Troubleshooting by Indication on the Remote Controller
U0
3.35 " " Outdoor Unit: Low Pressure Drop Due to
Refrigerant Shortage or Electronic Expansion Valve
Failure
U0
Remote
Controller
Display
Applicable RZQ18~30PVJU
Models
Method of Short of gas malfunction is detected by discharge pipe temperature thermistor and low pressure
Malfunction saturation temperature.
Detection
Malfunction
Microcomputer judge and detect if the system is short of refrigerant.
Malfunction 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 P.C.B. (A1P)
 Defect of thermistor R3T
129
SiUS28-902_a
Troubleshooting