Fujitsu ACUH09LUAS1, Service Manual

Page: 65 / 153

2-13. E: 41. Room temperature sensor error (Indoor unit)
Indicator
→ired remote
controller
Error code E: 41
Detective actuator Indoor unit main PCB
Room temperature thermistor is open or short is
detected always.
Room 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 room thermistor resistance value, refer to "Thermistor resistance values"
on page 03-53.
• 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 each indoor unit and check terminal voltage at thermis-
tor (DC 5.0 V).
NOTE: For details of thermistor connector, refer to "→iring diagrams" in Chapter 2.
TECHNICAL DATA AND PARTS LIST on page 02-22.
If the voltage does not appear, replace main PCB.
End
2-13. E: 41. Room temperature sensor error (Indoor unit)
- (03-17) -
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