Samsung UD26B1C2 When the compressor does not operate, Normal comp a B off Keep Comp a B off

3-3-9 When the compressor does not operate

1)Inspection items

(1)Is the COMP A under the operating conditions? (cooling operating of A, B(C) room)

(2)Is the power voltage normal? (the rating voltage ±10% range)

(3)Are the connector connection of COMP A(RY 72, 73) and B(RY 71) good?

(4)The COMP A(B) is operated on and off in accordance with the operating conditions of indoor unit of A (B. C) room.

2) Inspection sequence

Apply the outdoor power and operate the indoor unit A(B, C)

in the cooling mode.

		NO
Is the comp A under the operating condition?
	YES
Has 3 minutes passed COMP A(B) after the power initial		NO
and COMP on/off
	YES
Is comp A (B) on?
		YES
	NO *Refer to the power measuring terminal

Normal (comp A (B) off)

Keep Comp A (B) off

Normal

Is the voltage (the rating voltage ±10% range) shown across the terminal of Comp A(B) power applied?

YES

Defect of comp A (B) and running condenser

→Replace

	NO
Is the voltage of pin no. 14, 13( 15) at low		YES
(DC 0.7V)?
	NO
Is the voltage of pin no. 50, 51 (52) of IC 04 (micom) at		YES
high (DC 5V)?
	NO
Is comp A (B ) under the operating condition?		YES
	NO

Defect of Ry 72, 73 (Comp B) and Ry 71(comp A)

contact and coil → Replace

Defect of IC 06 output

→Replace

Defect of Ic 04 (micom)

→Replace

Normal (comp A (B ) off)

*Comp A (B ) operating conditions

(1)Comp A : Comp on /off control in accordance with the A room during the heating and cooling indoor unit operation

(2)Comp B : Comp on /off control in accordance with the B(C) room during the heating and cooling

indoor unit operation	BLK
	(3) RY72 (4)

BLK

* Comp A(B ) power measuring terminal		WHT
(1)	Comp A measuring ; RY 73 (4) ´ RY 72 (4)	(3) RY71 (4)
		(3) RY73	WHT
(2)	Comp B measuring ; RY 71 (4) ´ RY 72 (4)		(4)
		RED
(3)	Power input ; RY 72 (3) ´ RY 73(3)		RED

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