Fujitsu ABHG18KRTA, Service Manual

Page: 263 / 471

2-31. E: 76. 2-way valve thermistor error (Outdoor unit)
Indicator Indoor unit
Operation indicator 7 time flash
Timer indicator 6 time flash
Economy indicator Continuous flash
Error code E: 76
Detective actuator
Outdoor unit main PCB When 2-way valve temperature thermistor open or short
circuit is detected at power on or while running the
compressor.
2-way valve 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 outdoor temperature thermistor resistance value, refer to "Thermistor re-
sistance values" on page 03-94.
• 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 02-117.
If the voltage does not appear, replace main PCB.
↓
End
2-31. E: 76. 2-way valve thermistor error (Outdoor unit)
- (03-47) -
2. Troubleshooting with error code
TROUBLESHOOTING TROUBLESHOOTING