E: 71. Discharge Thermistor Error (Outdoor Unit) - Fujitsu GENERAL ASHG18KMTE Service Manual

2-21. E: 71. Discharge thermistor error (Outdoor unit)

Indicator Indoor unit
Outdoor unit main PCB
Detective actuator
Discharge pipe temperature
thermistor
Forecast of cause
Check point 1. Check connection of connector
• Check if connector is loose or removed.
• Check erroneous connection.
• Check if thermistor cable is open
Reset power when reinstalling due to removed connector or incorrect wiring.
Check point 2. Remove connector and check thermistor resistance value
• For the discharge temperature thermistor resistance value, refer to
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
TECHNICAL DATA AND PARTS LIST on page 02-18.
If the voltage does not appear, replace main PCB.
2-21. E: 71. Discharge thermistor error (Outdoor unit)
Operation indicator
Timer indicator
Economy indicator
Error code
on page 03-55.
End
- (03-26) -
7 time flash
1 time flash
Continuous flash
→hen discharge pipe temperature thermistor open or
short circuit is detected at power on or while running the
compressor
Connector failure
Thermistor failure
Main PCB failure
"Thermistor
"→iring diagrams" in Chapter 2.
E: 71
2. Troubleshooting with error code