Heat Controller DMH18DB-1 manual Service Manual, Troubleshooting Guide, Title, Cause of error

			Troubleshooting Guide
Error	Title	Cause of error	Check point & Normal condition
code
		• Open / Short	Normal resistor : 10KΩ / at 25°C(77°F) (Unplugged)
44	Outdoor air sensor	• Soldered poorly
			Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
		• Internal circuit error
		• Open / Short	Normal resistor : 5KΩ/ at 25°C(77°F) (Unplugged)
45	Condensor pipe sensor	• Soldered poorly
			Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
		• Internal circuit error
		• Open / Short	Normal resistor : 200KΩ/ at 25°C(77°F) (Unplugged)
47	D-Pipe sensor	• Soldered poorly
			Normal voltage : 4.5Vdc / at 25°C(77°F) (plugged)
		• Internal circuit error

Ω

Ω

Check the resistance

❑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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