Heat Sink Temp Sensor Error
OK
DC
Heat sink temp. sensor
Heat sink temp. sensor open/short detected
1. Connector connection defective, open
2. Sensor defective
3. Inverter 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 Inverter PCB (DC5.0V)
Inverter PCB (CN360: 1-2) voltage value = 5V
Remove the sensor from Inverter PCB, check the voltage.
Heat sink temp. sensor (CN360: 1-2)
Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash.
Outdoor Unit : E. 7 7. 1
Error Code : 9 U / 7 7
If the voltage does not appear, replace Inverter PCB.
Trouble shooting 43 E77. 1
Indicate or Display:
Detective Actuators:
Detective details:
OUTDOOR UNIT Error Method:
Forecast of Cause :
1
2
1
2
BLACK
BLACK
THERMISTOR (HEATSINK)
CN360
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.
04-52
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