Outdoor Temp Sensor Error
OK
DC
Outdoor temp. sensor
Outdoor temp. sensor short or open detected
1. Connector connection defective, open
2. Sensor defective
3. Main PCB defective
OK
Check Point 1 : Check the connector connection and cable open
Connector connection state check
Cable open check
Check Point 2: Check the sensor
Sensor characteristics check (Disconnect the sensor from the PCB and check.)
* For the sensor characteristics, refer to the "Service Parts Information 25".
Check Point 3 : Check voltage of Main PCB (DC5.0V)
Main PCB (CN144:1-3) voltage value = 5V
Remove the sensor from Main PCB, check the voltage.
Outdoor temp. sensor (CN144:1-3)
Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.
Outdoor Unit : E. 7 4. 1
Error Code : 9 U / 7 4
If the voltage does not appear, replace Main PCB and set up original address.
Trouble shooting 41 E74. 1
Indicate or Display:
Detective Actuators:
Detective details:
OUTDOOR UNIT Error Method:
Forecast of Cause :
1
2
3
BLACK
BLACK
THERMISTOR (OUT TEMP.)
CN144
Caution
By changing of DIP SW 4-2 to ON, the Back-up operation can start when the active outdoor unit exists on the multi outdoor unit connection.
(Stand alone outdoor unit is impossible)
The following conditions will be concerned in use of back-up operation. (Please do not use the system with back-up operation for long time.)
- The operating compressor life time becomes shorter.
- The operating performance may drop due to the limited active compressor(s).
- The compressor may stop frequently by protection controlling.
*In order to keep the operating capacity, the release of the Low noise mode setting might be necessary.
1
2
3
04-50
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