Troubleshooting 31 - Outdoor Unit Error Method: Liquid Pipe Temp. Sensor 2 Error - Fujitsu Airstage V series Service Manual

Trouble shooting 31
OUTDOOR UNIT Error Method:
Liquid Pipe Temp. Sensor 2 Error
Detective Actuators:
Outdoor Unit Controller PCB circuit
Liquid Temperature Thermistor
Forecast of Cause : 1. Connector connection failure 2. Thermistor failure 3. Controller PCB failure
Check Point 1 : Check connection of Connector
p Check if connector is loose or removed
p Check erroneous connection
p Check if thermistor cable is open
>>Reset Power when reinstalling due to removed connector or incorrect wiring.
OK
Check Point 2 : Remove connector and check Thermistor resistance value
Thermistor Characteristics (Rough value)
Temperature (°C)
Resistance Value ( )
If Thermistor is either open or shorted, replace it and reset the power.
OK
Check Point 3 : Check voltage of Controller PCB (DC5.0V)
Make sure circuit diagram of each indoor unit and check terminal voltage at Thermistor (DC5.0V)
Outdoor Unit Schematic(CN45,46)
If the voltage does not appear, replace Controller PCB and reset the original address.
Indicate or Display:
Outdoor Unit : LED1 Flash, LED3
Indoor Unit : Operation LED Lighted Continuously (Normal Operation)
ERROR CODE : E : 00
Detective details:
When Liquid Pipe Temperature Thermistor 2 is detected as SHORTED or
OPEN.
-10 -5.0 0
27.5 20.9 16.1
Liquid Pipe Temp. Thermistor 2 (CN46)
Heat Exchanger Liquid Temp. Thermistor
(CN45)
10 Times Blink
(No error display)
5.0 10 15.0
12.4 9.7 7.7
DC
06-42
20 25.0 30
6.1 4.9 3.9