Heat Controller B-MMC09FA-1 Service Manual page 74

Troubleshooting Guide
Error
code
44 Outdoor air sensor
45 Condensor pipe sensor
47 D-Pipe sensor
❑ 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
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Only for training and service purposes
Title Cause of error
• Open / Short
• Soldered poorly
• Internal circuit error
• Open / Short
• Soldered poorly
• Internal circuit error
• Open / Short
• Soldered poorly
• Internal circuit error
Check the resistance
Check point & Normal condition
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)
Ω
Ω
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LGE Internal Use Only