AirStage AO54FJ, Service Manual

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Trouble shooting 6
INDOOR UNIT INDOOR UNIT Error Method: Error Method:
HEAT EXCHANGER (Inlet)
THERMISTOR ABNORMAL
Detective Actuators: Detective Actuators:
Heat exchanger Temperature Thermistor
Detective details: Detective details:
If open Heat exchanger temp. thermistor is detected at the power on, or
when SHORT Heat exchanger temp. thermistor is detected at the power on.
Check Point 2 : Remove connector and measure the resistance value of thermistor Check Point 2 : Remove connector and measure the resistance value of thermistor
Thermistor characteristics (Approx)
Turn off the main power, replace the thermistor is it was open or short, then turn on the main power.
31.7
35
39.5
30
49.6 62.9 80.2 103.3 134.2 176.0 Resistance Value ( ) k
25 20 15 10 5 0 Temperature ( )
17.0 20.8 25.6 Resistance Value ( ) k
50 45 40 Temperature ( )
Indicate or Display: Indicate or Display:
Indoor Unit : Operation LED 3 Times Blink 3 Times Blink , , Timer LED Flash Flash
Swing LED 1 time Blink 1 time Blink
Outdoor Unit : LED1 Flash, LED6
1 8TIMES Blink (Indoor Unit address)
ERROR CODE : E:06 E:06
Forecast of Cause Forecast of Cause:
1. Connector connection failure
2. Thermistor failure
3. Control PCB defective
Check Point 1 : Check the installation work Check Point 1 : Check the installation work
Removed connector
Incorrect wiring
Thermistor cable is cut off
When reworking on loose connector, incorrect wiring, keep the power shut off.
Check Point 3 : Check DC5.0V of Control PCB voltage Check Point 3 : Check DC5.0V of Control PCB voltage
Check each indoor unit circuit diagram, and check the
voltage at both terminal of thermistor.
Heat exchanger Temp Thermo (Wire: BLACK)
Heat exchanger Temp (Mid)Thermo. (Wire:GRAY)
Room temp. thermo (Wire: BLACK)
Cassette Duct Wall Mounted (Except M3) Indoor unit wiring diagram
M3 Chassis Wiring Diagram(Direct soldering to Control PCB) No wiring connector.
If it is not possible to check the voltage, replace Control PCB and set up the original address.
Heat exchanger Temp Thermo (Wire: BLACK)
Heat exchanger Temp (Mid)Thermo. (Wire:GRAY)
Room temp. thermo (Wire: BLACK)
06-11