Troubleshooting Guide
Troubleshooting
CH01,
CH02,
CH06
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| Check point & Normal condition | ||||||||||
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| Indoor air sensor |
| • Open / Short | Normal resistor : 10KΩ | / at 25°C(77°F) (Unplugged) | |||||||||||||||
01 |
| • Soldered poorly | ||||||||||||||||||
| Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged) | |||||||||||||||||||
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| • Internal circuit error | ||||||||||||
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| • Open / Short | Normal resistor : | 5KΩ | / at 25°C(77°F) (Unplugged) | |||||||||
02 | Indoor inlet pipe sensor |
| • Soldered poorly | |||||||||||||||||
| Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged) | |||||||||||||||||||
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| • Internal circuit error | ||||||||||||
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| • Open / Short | Normal resistor : | 5KΩ | / at 25°C(77°F) (Unplugged) | |||||||||
06 | Indoor outlet pipe sensor |
| • Soldered poorly | |||||||||||||||||
| Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged) | |||||||||||||||||||
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| • Internal circuit error | ||||||||||||
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10kΩ
Ω
Check the resistance
2.5Vdc
V
Check the voltage
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(77°F), 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(77°F), then sensor is normal.
8.If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. → Repair or Change the PCB.
38Ceiling Cassette Air Conditioner