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TheAChub
Refrigerant Shortage
Error Code U0
Applicable Models
REYQ-T Method of Error Detection
Detect refrigerant shortage according to a low pressure level or a difference in heat exchanging temperature from the suction pipe. Error Decision Conditions
Low pressure becomes 0.1 MPa (33.5 ftH2O) or less. ∗ Error is not determined. The unit continues the operation.
Supposed Causes
Refrigerant shortage and refrigerant clogging (wrong piping) Defective thermistor
Defective low pressure sensor Defective outdoor unit main PCB Troubleshooting
Replace the outdoor unit main PCB (A1P). Remove the factor of decreasing low pressure.
CHECK 2
Note: ∗1.Check the low pressure value by using pressure gauge in operation.
∗2.Compare the actual measurement value by pressure sensor with the value by the pressure gauge.
(To gain actual measurement value by pressure sensor, measure the voltage at the connector [between (2)-(3)] and then convert the value into pressure. CHECK 12 ) CHECK 2
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