Daikin E Series, Service Manual

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SiAU18-715 Troubleshooting for Outdoor Unit
Troubleshooting 367
7.8 Refrigerant Overcharged
Remote
Controller
Display
F6
Applicable
Models All outdoor unit models
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 P405.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Remove the heat
exchanging deicer
thermister from the outdoor
PCB and measure
resistance with a tester.
Check the mounting
condition of the temperature
sensors of the heat
exchanging deicer
thermistor in the piping.
Are the
above thermistor
installed on pipes
correctly?
Is the
characteristic of the
above thermistor
normal?
Refrigerant overcharged.
(Q0557)
Install thermistor correctly.
NO
Replace thermistor.
NO
YES
YES