E: 73. Heat Exchanger (Middle/Outlet) Temperature Thermistor Error (Outdoor Unit) - Fujitsu AUXG36KRLB Service Manual

2-23. E: 73. Heat exchanger (Middle/Outlet) temperature
thermistor error (Outdoor unit)
Wired remote
Indicator
controller
Heat exchanger liquid temperature
thermistor
Detective actuator
Heat exchanger middle
temperature thermistor
Forecast of cause
Check Point 1 : Check the connector connection and cable open
• Connector connection state check
• Cable open check
Check Point 2 : Check the thermistor
• For the outdoor unit heat exchanger thermistor resistance value, refer to
mistor resistance values"
• If thermistor is either open or shorted, replace it and reset the power.
Check point 3. Check voltage of main PCB
Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor
(DC 5.0 V).
NOTE: For details of thermistor connector, refer to "Wiring diagrams" in Chapter 2.
TECHNICAL DATA AND PARTS LIST.
If the voltage does not appear, replace main PCB.
2-23. E: 73. Heat exchanger (Middle/Outlet) temperature thermistor error (Outdoor
unit)
Error code
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on page 03-61.
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E: 73
Heat exchanger liquid temperature thermistor short
or open detected
Heat exchanger middle temperature thermistor
short or open detected
Connector failure
Thermistor failure
Main PCB failure
"Ther-
2. Troubleshooting with error code