ESIE15-13B Troubleshooting by Remote Controller
Service Diagnosis 183
4.40 Transmission Error between Indoor and Outdoor Unit /
Piping and Wiring Mismatch / Refrigerant Shortage
Remote
Controller
Display
UF
Applicable
Models
RZQG
Method of Error
Detection
Check the transmission between the indoor and outdoor units with a micro-computer when the
power turned ON.
Detect by checking the following temperature differences during compressor operation.
A: Difference in temperature detected by the indoor heat exchanger thermistor (R2T) and
the indoor suction air thermistor (R1T)
B: Difference in evaporation temperature (Te) (or condensation temperature (Tc) during
heating operation) detected by the indoor heat exchanger thermistor (R2T) and the
compressor sensor
Error Decision
Conditions
When the inter-unit wiring between the indoor and outdoor units is incorrect
When the following conditions continue for 20 minutes during compressor operation
A: R2T – R1T < 4ºC, and
B: R2T – Te (or Tc during heating operation) > 14ºC (24ºC during heating operation)
Supposed
Causes
Defective inter-unit wiring between the indoor and outdoor units
Mismatching of wiring and piping
Refrigerant shortage (shortage of gas)
Clogged refrigerant piping system
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