Trouble shooting 23
OUTDOOR UNIT Error Method:
Detective Actuators:
Detective details:
Forecast of Cause :
OK
OK
OK
OK
16.1
5
20.7
26.9
35.2
46.6
62.3
115.2
Resistance value (k )
5
-
0
-10
-20
224.3
-30
Temperature
(°C )
10
15
1.7
2.4
3.5
5.2
8.0
Resistance value (k )
70
1.2
80
0
3
0
4
0
5
0
6
12.6
20
Temperature
(°C )
Outdoor Thermistor Error
Outdoor unit Main PCB
Outdoor temperature thermistor
When Outdoor temperature thermistor open or short-circuit
is detected at power ON or while running the compressor.
1. Connector connection failure 2. Thermistor failure 3. Main PCB failure
Check Point 1 : Check connection of connector
Check if connector is removed.
Check if connector is erroneous connection.
Check if thermistor cable is open.
>> Upon correcting the removed connector or mis-wiring, reset the power.
Check Point 2 : Remove connector and check thermistor resistance value
Thermistor characteristics (Approx. value)
If Thermistor is either open or shorted, replace it and reset the power.
Check Point 3 : Check voltage of Main PCB (DC5.0V)
Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC5.0V)
If the voltage does not appear, replace Main PCB.
02-26
BROWN
BROWN
BLUE
BLUE
Thermistor
(Discharge pipe)
Thermistor
(Heat exchanger)
Thermistor
(Outdoor temp.)
Thermistor
(Compressor temp.)
3
2
1
3
2
1
3
2
1
3
2
1
CN62
BLACK
BLACK
3
2
1
3
2
1
CN65
BROWN
BROWN
3
2
1
3
2
1
CN63
CN64
Indicate or Display:
Indoor Unit :
Operation lamp: 7 times Flash,
Timer lamp : 4 times Flash
ERROR CODE : [E : 74]
Wired Remote Controller :
AMP Air Conditioning
www.ampair.co.uk | [email protected]
