Troubleshooting 29-1 - Outdoor Unit Error Method: Sc Heat Exchanger Outlet Temp Sensor Error - Fujitsu Airstage V series Service Manual

Trouble shooting 29-1
OUTDOOR UNIT Error Method:
SC Heat Exchanger Outlet Temp
Sensor Error
Detective Actuators:
Outdoor Unit Controller PCB circuit
SC Heat Ex. Gas Outlet Temp. Thermistor
Trouble shooting 29-2
OUTDOOR UNIT Error Method:
SC Heat Exchanger Inlet Temp
Sensor Error
Detective Actuators:
Outdoor Unit Controller PCB circuit
SC Heat Ex. Gas Intlet Temp. 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 (29-1)
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(CN38)
RCV Liquid Surface Thermistor
RCV Liquid Surface Thermistor 2(CN38:3-4)
RCV Liquid Surface Thermistor 3(CN38:5-6)
SC Heat Exchanger Gas Outlet Temp.
Thermistor(CN38:7-8)
Heat Exchanger Temperature Thermistor
1 (CN38:9-10)
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 SC Heat Exchanger Gas Outlet Temperature Thermistor is detected as
SHORTED or OPEN.
Indicate or Display:
Outdoor Unit : LED1 Flash, LED3
Indoor Unit : Operation LED Lighted Continuously (Normal Operation)
ERROR CODE : E : 00
Detective details:
When SC Heat Exchanger Gas Inlet Temperature
SHORTED or OPEN.
-10 -5.0 0
27.5 20.9 16.1
1(CN38:1-2)
8 Times Blink
(No error display)
13 Times Blink
(No error display)
5.0 10 15.0
12.4 9.7 7.7
OK(29-2)
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)
If the voltage does not appear, replace Controller PCB and
reset the original address.
06-40
Thermistor is detected as
20 25.0 30
6.1 4.9 3.9
SC Heat Exchanger
Gas Intlet Temp.
Thermistor (CN19)
DC