Heat Controller DMH18DB-1 ElectronicPartsTroubleshooting Guide, Procedure, Specification, Remedy

Troubleshooting Guide

ElectronicPartsTroubleshooting Guide

❇Refer to electronic contorol device drawing & schematic diagram.

Trouble 1 The Product doesn’t operate at all.

Turn off the main power and wait until LED on outdoor PCB is off.

Turn on the main power again.

Does "Beeping" sound is made from the indoor unit?

NO

Check the voltage of power(AC208V/AC230V, 60Hz).

•The voltage of main power.

•The voltage applied to the unit.

•The connecting method of Indoor/Outdoor connecting cable (each color)

•The P.W.B. Ass'y

(Fuse, Noise Filter, Power Transformer, IC01D, IC02D, etc.)

YES

•Primarily, the operating condi- tion of Micom is O.K.

•Check CN-DISP1

The operation check of the P.C.B. Ass'y

	Procedure		Specification		Remedy
1)	The input voltage of power trans-	1)	AC230V ± 30V	1)	Replace
	former.		: Check the rated voltage		power transfomer.
2)	The output voltage of power	2)	15V ± 1.5V	2)	Replace
	transformer.				power transfomer.
3)	IC01D(7812)	3)	DC12V	3) Replace IC01D.
4)	IC02D(7805)	4)	DC5V	4) Replace IC02D.
5)	IC01A(KIA7036)	5)	The voltage of micom pin 29	5)	Replace IC01A.
			: DC4.5V↑

Service Manual 57