Daikin ERQ - U0 Low Pressure Drop Due to Refrigerant Shortage or Electronic Expansion Valve Failure

ESIE09-05 Troubleshooting by Indication on the Remote Controller
Troubleshooting 207
3.38 “U0” Low Pressure Drop Due to Refrigerant Shortage or
Electronic Expansion Valve Failure
Remote
Controller
Display
U0
Applicable
Models
ERQ 125 ~ 200 A7V1
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
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