U0 " Low Pressure Drop Due To Refrigerant Shortage Or Electronic Expansion Valve Failure - Daikin ERSQ 011AAV1 Service Manual

ESIE09-08
3.52 "U0 " Low Pressure Drop Due to Refrigerant Shortage or
Electronic Expansion Valve Failure
U0
Remote Control
Display
Applicable
ER*Q 011~016*
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
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
191