Daikin ERSQ 011AAV1, Service Manual

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ESIE09-08 Troubleshooting by Indication on the Remote Controller
Troubleshooting 191
3.52
“U0”
Low Pressure Drop Due to Refrigerant Shortage or
Electronic Expansion Valve Failure
Remote Control
Display
U0
Applicable
Models
ER*Q 011~016*
Method of
Malfunction
Detection Short of gas malfunction is detected by discharge pipe temperature thermistor and low pressure
saturation temperature.
Malfunction
Decision
Conditions Microcomputer judge and detect if the system is short of refrigerant.
+
Malfunction is not decided while the unit operation is continued.
Supposed
Causes
„
Out of gas or refrigerant system clogging (incorrect piping)
„ Defect of pressure sensor
„ Defect of outdoor unit PC board (A1P)
„ Defect of thermistor R3T