Troubleshooting by Remote Controller Si20-701_B
349
3.84
U0
Low Pressure Drop Due to
Refrigerant Shortage or
Electronic Expansion Valve
Failure
Remote Controller Display
U0
Applicable Models
CMSQ
Method of Error Detection
Refrigerant shortage is detected by discharge pipe
thermistor.
Error Decision Conditions
Micro-computer judge and detect if the system is short of
refrigerant.
∗ The error is not decided while the unit operation is
continued.
Supposed Causes
îš„ Refrigerant shortage or refrigerant system clogging
(incorrect piping)
îš„ Defective low pressure sensor
îš„ Defective outdoor unit PCB (A1P)
îš„ Defective thermistor R7T or R4T
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