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
74 Multi type Air Conditioner
Title
• Open / Short
• Soldered poorly
• Internal circuit error
• Open / Short
• Soldered poorly
• Internal circuit error
• Open / Short
• Soldered poorly
• Internal circuit error
Check the resistance
Cause of 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)
Ω
Ω
Check point & Normal condition