74 Multi type Air Conditioner
Troubleshooting Guide
Error
Title Cause of error Check point & Normal condition
code
44 Outdoor air sensor
45 Condensor pipe sensor
47 D-Pipe sensor
• Open / Short
• Soldered poorly
• Internal circuit error
• Open / Short
• Soldered poorly
• Internal circuit error
• Open / Short
• Soldered poorly
• Internal circuit error
Normal resistor : 10KΩ / at 25°C(77°F) (Unplugged)
Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
Normal resistor : 5KΩ/ at 25°C
(77°F)
(Unplugged)
Normal voltage : 2.5Vdc / at 25°C
(77°F)
(plugged)
Normal resistor : 200KΩ/ at 25°C
(77°F)
(Unplugged)
Normal voltage : 4.5Vdc / at 25°C
(77°F)
(plugged)
❑ Check Point
1. Estimate the resistance of each sensor.(Unplugged)
2. Estimate the voltage of each sensor.(Plugged)
3. If the resistance is 0V or 5Vdc, then sensor is abnormal
Check the resistance
Ω
Ω
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