E: 41. Room Temperature Sensor Error (Indoor Unit) - Fujitsu ASUG09LMAS Service Manual

2-7. E: 41. Room temperature sensor error (Indoor unit)

Indicator Indoor unit
Indoor unit main PCB
Detective actuator
Room 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 room thermistor resistance value, refer to
on page 03-40.
• 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
TECHNICAL DATA AND PARTS LIST on page 02-14.
If the voltage does not appear, replace main PCB.
2-7. E: 41. Room temperature sensor error (Indoor unit)
Operation indicator
Timer indicator
Economy indicator
Error code
Room temperature thermistor is open or short is
detected always.
↓
"Thermistor resistance values"
↓
"Wiring diagrams"
↓
End
- (03-10) -
4 time flash
1 time flash
Continuous flash
E: 41
Connector failure
Thermistor failure
Main PCB failure
in Chapter 2.
2. Troubleshooting with error code