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2-22. E: 73. Heat exchanger (Middle/Outlet) temperature

thermistor error (Outdoor unit)

Indicator

Wired remote

controller

Error code E: 73

Detective actuator

Heat exchanger liquid temperature

thermistor

• Heat exchanger liquid temperature thermistor short

or open detected

• Heat exchanger middle temperature thermistor

short or open detected

Heat exchanger middle

temperature thermistor

Forecast of cause

Connector failure

Thermistor failure

Main PCB failure

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 "Ther-

mistor resistance values" on page 03-60.

• 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 on page 02-33.

If the voltage does not appear, replace main PCB.

↓

End

2-22. E: 73. Heat exchanger (Middle/Outlet) temperature thermistor error (Outdoor

unit)

- (03-26) - 2. Troubleshooting with error code

TROUBLESHOOTING

Fujitsu ARXG22KMLA User Manual

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