Transmission Error Between Indoor And Outdoor Unit / Piping And Wiring Mismatch / Refrigerant Shortage - Daikin RZQ Series FCQ20EVA Service Manual

Troubleshooting by Remote Controller
4.45 Transmission Error between Indoor and Outdoor Unit /
Piping and Wiring Mismatch / Refrigerant Shortage
UF
Error Code
Applicable RZQ
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 transmission wiring between the indoor and outdoor units is incorrect
When the following conditions continue for 20 minutes during compressor operation
Conditions
 Defective transmission wiring between the indoor and outdoor units
Supposed
 Mismatching of wiring and piping
Causes
 Refrigerant shortage
 Clogged refrigerant piping system
Troubleshooting
Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
UF
Does " "
appear when the power is
turned ON?
NO
Is the
connection of
transmission wiring and
piping between the indoor and
outdoor units
matched?
YES
CHECK 12
Is the refrigerant level
proper?
YES
CHECK 10 Refer to P.161.
CHECK 12 Refer to P.163.
151
A: Difference in temperature detected by the indoor heat exchanger thermistor (R2T) and
the indoor suction air thermistor (R1T)
B: Difference in evaporating temperature (Te) (or condensing 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)
YES
The phase of transmission wiring
between the indoor and outdoor units
is incorrect.
NO
NO
SiME281501E
Correctly connect transmission
wiring between the indoor and
outdoor units.
Match the connection of the
transmission wiring and piping
between the indoor and outdoor
units.
Recharge a proper amount of
refrigerant after refrigerant
recovery and vacuum drying.
CHECK 10
Check the refrigerant piping
system for clogging.
Service Diagnosis