Service manual

SiUS28-902_a Troubleshooting by Indication on the Remote Controller
Troubleshooting 112
3.21 “F6” Outdoor Unit: Refrigerant Overcharged
Remote
Controller
Display
F6
Applicable
Models
RZQ18~30PVJU
Method of
Malfunction
Detection
Excessive charging of refrigerant is detected by using the heat exchanging deicer temperature
during a check operation.
Malfunction
Decision
Conditions
When the amount of refrigerant, which is calculated by using the heat exchanging deicer
temperature during a check run, exceeds the standard.
Supposed
Causes
 Refrigerant overcharge
 Misalignment of the thermistor for heat exchanger
 Defect of the thermistor for heat exchanger
Troubleshooting
Refer to “Thermistor Resistance / Temperature Characteristics” table on P.166.
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts could be damaged.
Are the
above thermistor
installed on pipes
correctly?
Check the mounting condition
of the temperature sensors of
the heat exchanging deicer
thermistor in the piping.
Remove the heat exchanging
deicer thermistor from the
outdoor P.C.B. and measure
resistance with a tester.
Is the
characteristic of the
above thermistor
normal?
Refrigerant overcharged.
YES
NO
NO
Replace the thermistor.
Install the thermistor correctly.
YES