Troubleshooting by Indication on the Remote Controller
250
3.58
U0
Refrigerant Shortage Alert
Remote Controller Display
U0
Applicable Models
VRVIII, III-S and III-Q Series
Method of Error Detection
Detect refrigerant shortage based on the temperature
difference between low pressure or suction pipe and heat
exchanger.
Error Decision Conditions
[In cooling mode]
Low pressure becomes 0.1MPa or below.
[In heating mode]
The degree of superheat of suction gas becomes 20°C
and over.
SH = Ts1 –Te
Ts1: Suction pipe temperature detected by
thermistor
Te : Low pressure equivalent saturation
temperature
∗ Error is not determined. The unit continues the
operation.
Supposed Causes
Refrigerant shortage or refrigerant clogging (piping
error)
Defective thermistor
Defective low pressure sensor
Defective outdoor unit PCB
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