Service Manual

Troubleshooting for Outdoor Unit SiUS181631EA
236 Troubleshooting
7.8 Refrigerant Overcharged
Error Code
F6
Method of Error
Detection
Excessive charging of refrigerant is detected during check operation by using outdoor temperature,
outdoor heat exchanger temperature, and liquid pipe temperature.
Error Decision
Conditions
When the amount of refrigerant, which is calculated during check operation by using outdoor
temperature, outdoor heat exchanger temperature, and liquid pipe temperature, exceeds the
standard.
Supposed
Causes

Refrigerant overcharge

Incorrect installation of outdoor temperature thermistor, outdoor heat exchanger thermistor,
liquid pipe thermistor (R1T, R4T, R7T)

Defective outdoor temperature thermistor, outdoor heat exchanger thermistor, liquid pipe
thermistor (R1T, R4T, R7T)
Troubleshooting
Refer to Thermistor Resistance/Temperature Characteristics table 1 on page 267.
Remove the outdoor
temperature thermistor,
outdoor heat exchanger
thermistor, liquid pipe
thermistor from the outdoor
PCB and measure the
resistance with a multimeter.
Check the mounting condition
of the outdoor temperature
thermistor, outdoor heat
exchanger thermistor, liquid
pipe thermistor.
Are the thermistors
installed on pipes
correctly?
Is the
characteristic of the
thermistors normal?
Correct the amount of
refrigerant.
(R22097)
Install the thermistor
correctly.
NO
Replace the defective
thermistor.
NO
YES
YES
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.