Table of Contents
Advertisement
Trouble shooting 7
INDOOR UNIT Error Method:
Indoor room thermistor error
Detective Actuators:
Indoor unit Controller PCB
Room temperature thermistor
Forecast of Cause : 1. Connector failure connection 2. Thermistor failure 3. Controller 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.
OK
Check Point 2 : Remove connector and check Thermistor resistance value
Thermistor Characteristics (Rough value)
Temperature (°C)
Resistance 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)
Duct circuit diagram (Connector connection)
GRAY
1
1
CN5
GRAY
2
2
H/E (MID) Thermistor
1
CN7
2
Room Temp. Thermistor
BLACK
1 1
CN8
BLACK
2 2
Cassette circuit diagram (Connector connection)
H/E (MID) Thermistor
GRAY
1
1
CN5
GRAY
2
2
Room Temp. Thermistor
BLACK
1 1
CN8
BLACK
2
2
Universal floor / ceiling circuit diagram (Connector connection) Floor circuit diagram (Connector connection and Direct soldering to PCB)
BLACK
GRAY
1
1
1
1
CN5
BLACK
GRAY
2
2
2
2
1
CN7
2
Room Temp. Thermistor
BLACK
1 1
CN8
BLACK
2 2
If the voltage does not appear, replace Controller PCB.
Indicate or Display:
Refer to error code table.
Detective details:
Room temperature thermistor is open or short is detected always.
-10
-5
0
58.2
44.0
33.6
30
35
40
8.0
6.5
5.3
H/E (MID) Thermistor
5
10
15
25.2
20.2
15.8
12.5
45
4.3
Small size Wall mount circuit diagram(Connector connection)
H/E Thermistor
BLACK
1
1
BLACK
2
2
CN4
BLACK
3
3
BLACK
4
4
Room Temp. Thermistor
Wall mount Scircuit diagram (Direct soldering to PCB)
RED
BLACK
1
1
1
CN3
2
2
2
WHITE
BLACK
3 3
Room Temp. Thermistor
BLACK
1
CN1
BLACK
2
H/E (MID) Thermistor
GRAY
1
1
CN3
GRAY
2
2
Room Temp. Thermistor
BLACK
1
CN1
BLACK
2
02-10
20
25
10.0
H/E Thermistor
DC
Hide quick links:
Advertisement
Table of Contents
Troubleshooting
