Check Point
1. Unplug the sensor on Indoor unit PCB.
2. Estimate the resistance of each sensor.
3. If the resistance of the sensor is 10KΩ/ 5KΩ at 25°C, then sensor is normal.
4. If the resistance of the sensor is 0 KΩ or ∞, then sensor is abnormal. ’ Change the sensor.
5. Plug the sensor on Indoor unit PCB and Power ON.
6. Estimate the voltage of each sensor.
7. If the voltage of the sensor is 2.5Vdc at 25°C, then sensor is normal.
8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. ’ Repair or Change the PCB.
6.6 Troubleshooting Indoor Error
01
02
06
Indoor air sensor
Indoor inlet pipe sensor
Indoor outlet 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 (Unplugged)
Normal voltage : DC 2.5V / at 25°C (plugged)
Normal resistor : 5KΩ/ at 25°C (Unplugged)
Normal voltage : DC 2.5V / at 25°C (plugged)
Normal resistor : 5KΩ/ at 25°C (Unplugged)
Normal voltage : DC 2.5V / at 25°C (plugged)
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code
Title Cause of error Check point & Normal condition
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