Fujitsu AOUH18LMAS1, Service Manual

Page: 76 / 215

2-19. E: 71.X. Discharge thermistor error (Outdoor unit)
Indicator
Indoor unit
Operation indicator 7 time flash
Timer indicator 1 time flash
Economy indicator Continuous flash
Error code E: 71
outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4
Detective actuator
Outdoor unit main PCB
→hen discharge pipe temperature thermistor open or
short circuit is detected at power on or while running the
compressor
Discharge pipe temperature
thermistor
Forecast of cause
Connector failure
Thermistor failure
Main PCB failure
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 "Thermistor
resistance values" on page 03-88.
• 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 "→iring diagrams" in Chapter 2.
TECHNICAL DATA AND PARTS LIST on page 02-18.
If the voltage does not appear, replace main PCB.
End
2-19. E: 71.↓. Discharge thermistor error (Outdoor unit)
- (03-34) -
2. Troubleshooting with error code
TR
O
U
B
LESH
O
O
TI
N
G
TR
O
U
B
LESH
O
O
TI
N
G