Specifications

SiBE341027 Troubleshooting by Remote Controller
Service Diagnosis 149
2.29 Refrigerant Shortage
Remote
Controller
Display
U0
Applicable
Models
RQYQ-PY1B
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 less.
[In heating mode]
The degree of superheat of suction gas becomes 20 degrees or more.
SH= Ts1 –Te
Ts1: Temperature detected by suction pipe thermistor
Te : Low pressure equivalent saturation temperature
★
Error is not determined. The unit continues operation.
Supposed
Causes

Refrigerant shortage or refrigerant clogging (wrong piping)

Defective thermistor (R8T, R9T)

Defective low pressure sensor

Defective outdoor unit PCB (A1P)