Heat Controller MSS-018B/A manual Turn off Main Power Cý After 10 seconds, Fuse Pattern damage

2. Product does not operate at all.

LJ

(" Refer to Electronic Control Device drawing and Schematic diagram.)

Turn off Main Power

.Cý_ (After 10 seconds)

Tum on Main Power

Does "beeping" sound is made from the Indoor Unit?

NO

Check the voltage of power(About AC 208V/AC230V, 60HZ)

YES

Primarily, the operating condition of Micom is OK.

Main power's voltage

Voltage applied to the unit

Connecting method of Indoor/Outdoor connecting cable

Check PWB Ass'y(Outdoor unit)

-Fuse

-Pattern damage

-Varistor(ZNRI)

Check the connection housing for contacting

"Connector related to CN-POWER

"Connector related to CN-FAN

"Connector contacting of Outdoor Fan/Compressor

"Display PWB Ass'y Check

"Connector related to CN-DC/DC

Check each load(Indoor/Outdoor Fan Motor,

Compressor, Stepping Motor) and contacting condition of related connector(including connecting cable of Indoor/Outdoor Unit)

	PCB Board Operation Check
Items	Content	Remedy
" Power Transformer
(Outdoor unit)
Input Voltage	-About AC208V/230V&10% -Check the power voltage	" Replace Trans
Output Voltage	About AC17t3V
I&
" IC2(7812) Output	" DC +12V	" Replace IC2
(Indoor/Outdoor unit)
4		" Replace IC3
" IC3(7805) Output	" DC +5V
(Indoor/Outdoor unit)
I&
" IC4(KIA7036, Reset IC)	" Voltage of Outdoor unit Micom No. 8,	" Replace faulty parts
X01(4MHz)	Voltage of Indoor unit Micom No. 43 and soldering
(Indoor/Outdoor unit)	condition
	-50-

"