Troubleshooting by Error Code SiAF332111E
296 Part 6 Service Diagnosis
5.55.3 Refrigerant Shortage (10/12 HP Models)
Applicable
Models
RXMQ10/12AR
Error Code U0
Method of Error
Detection
Refrigerant shortage check is conducted based on the discharge pipe thermistor temperature
and the low-pressure saturated temperature.
Error Decision
Conditions
Low pressure becomes 0.1 MPa or below.
Supposed
Causes
Refrigerant shortage or refrigerant clogging (piping error)
Defective thermistor
Defective low pressure sensor
Defective outdoor unit main PCB (A1P)
Troubleshooting
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.
CHECK 2 Refer to page 338.
CHECK 12 Refer to page 353.
Check if the low
pressure is 0.1 MPa or
below. (1)
Check if the property of
low pressure sensor
is normal.
(2)
Replace the low pressure
sensor.
Replace the outdoor unit main
PCB (A1P).
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
NONO
YES
YES
Eliminate factors that cause
decreasing low pressure by
referring to CHECK 2 .
(1) Set up a pressure gauge at the service port on the low
pressure side.
(2) Reset the operation using the remote controller then restart.
CHECK 12
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