Error Code - Heat Controller DMH18DB-1 Service Manual

Troubleshooting Guide

Error Code

I Trouble Shooting
Error
code
01 Indoor air sensor
02 Indoor inlet pipe sensor
06 Indoor outlet pipe sensor
❑ 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
62 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
10KΩ
Ω
Check the resistance / voltage
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 : 5KΩ/ at 25°C(77°F) (Unplugged)
Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
Check point & Normal condition
2.5Vdc
V