Friedrich MD24Y3J Svc Manual page 75

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