Troubleshooting by Indication on the Remote Controller SiBE31-801_C
293 Troubleshooting
4.44 “
U0
” Outdoor Unit: Refrigerant Shortage Alert
Remote
Controller
Display
U0
Applicable
Models
RTSQ8P~16P (Outdoor Unit)
Method of
Malfunction
Detection
Detect refrigerant shortage based on the temperature difference between low pressure or
suction pipe and heat exchanger.
Malfunction
Decision
Conditions
[In cooling mode]
Low pressure becomes 0.1MPa or below.
[In heating mode]
The degree of superheat of suction gas becomes 20 degrees and over.
SH= Ts1 –Te
Ts1: Suction pipe temperature detected by thermistor
Te : Saturated temperature corresponding to low pressure
★
Malfunction is not determined. The unit continues operation.
Supposed
Causes
Refrigerant shortage or refrigerant clogging (piping error)
Defective thermistor (R4T, R8T)
Defective low pressure sensor
Defective outdoor unit PCB (A1P)
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