Transmission Error Between Indoor And Outdoor Unit / Piping And Wiring Mismatch / Refrigerant Shortage - Daikin ZQG71~140L7V1B Service Manual

ESIE12-06
4.38 Transmission Error between Indoor and Outdoor Unit /
Piping and Wiring Mismatch / Refrigerant Shortage
UF
Remote
Controller
Display
Applicable
RZQG
Models
Method of Error
Check the transmission between the indoor and outdoor units with a micro-computer when the
Detection power turned ON.
Detect by checking the following temperature differences during compressor operation.
Error Decision When the inter-unit wiring between the indoor and outdoor units is incorrect
When the following conditions continue for 20 minutes during compressor operation
Conditions
Supposed
 Defective inter-unit wiring between the indoor and outdoor units
Causes  Mismatching of wiring and piping
 Refrigerant shortage (shortage of gas)
 Clogged refrigerant piping system
Service Diagnosis
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
A: R2T – R1T < 4ºC, and
B: R2T – Te (or Tc during heating operation) > 14ºC (24ºC during heating operation)
Troubleshooting by Remote Controller
191