Multi F Four-Way Ceiling Cassette Service Manual

Part 5. Trouble Shooting
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Only for training and service purposes
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Display
code
Title Cause of error Check point & Normal condition
41 D-pipe sensor (Inverter)
• Open / Short
• Soldered poorly
• Internal circuit error
1. Bad connection of thermistor connector
2. Defect of thermistor connector (Open/Short)
3. Defect of outdoor PCB
44 Air sensor
• Open / Short
• Soldered poorly
• Internal circuit error
1. Bad connection of thermistor connector
2. Defect of thermistor connector (Open/Short)
3. Defect of outdoor PCB
45
Condenser Mid-pipesen-
sor
• Open / Short
• Soldered poorly
• Internal circuit error
1. Bad connection of thermistor connector
2. Defect of thermistor connector (Open/Short)
3. Defect of outdoor PCB
46 Suction Pipe sensor
• Open / Short
• Soldered poorly
• Internal circuit error
1. Bad connection of thermistor connector
2. Defect of thermistor connector (Open/Short)
3. Defect of outdoor PCB
48
Condenser Out-pipe sen-
sor
• Open / Short
• Soldered poorly
• Internal circuit error
1. Bad connection of thermistor connector
2. Defect of thermistor connector (Open/Short)
3. Defect of outdoor PCB
Ω"
Check Point
1. Estimate the resistance of each sensor.(Unplugged)
2. Check the value of the resistor of thermistor.
D-pipe sensor (Inverter) : Normal Value of the resistor is 200kΩ at 25℃
Air sensor : Normal Value of the resistor is 10kΩ at 25℃
Cond. Mid-pipe sensor : Normal Value of the resistor is 5kΩ at 25℃
Suction pipe sensor : Normal Value of the resistor is 5kΩ at 25℃
Condenser Out-pipe sensor : Normal Value of the resistor is 5kΩ at 25℃
Is sensor connected
to PCB correctly??
Is sensor value correct?*
Connect sensor to PCB correctly
Replace sensor
Replace corresponding
outdoor unit PCB
Yes
No
No
Yes
■ Error Diagnosis and Countermeasure Flow Chart