Heat Sink Temp Sensor Error - Fujitsu Airstage V-II Service Manual

Trouble shooting 33
OUTDOOR UNIT Error Method:

Heat Sink Temp Sensor Error

Detective Actuators:
Heat sink temperature thermistor
Forecast of Cause :
1. Connector connection defective, open
2. Thermistor defective
3. Inverter PCB defective
Check Point 1 : Check the connector connection and cable open
Connector connection state check
Cable open check
OK
Check Point 2 : Check the thermistor
Thermistor characteristics check (Disconnect the thermistor from the PCB and check.)
* For the thermistor characteristics, refer to the "Service Parts Information 22".
OK
Check Point 3 : Check voltage of Inverter PCB (DC5.0V)
Inverter PCB (CN800:1-2) voltage value = 5V
Remove the thermistor from Inverter PCB, check the voltage.
Heat sink temperature thermistor (CN800:1-2)
If the voltage does not appear, replace Inverter PCB
and set up orignal address.
Indicate or Display:
Outdoor Unit : E. 77. 1
Indoor Unit
Error Code
Detective details:
Heat sink temperature thermistor open/short detected
2 1
2 1
CN 800
: Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.
: 77
DC
04-41