Sanyo SAP-KRV94EHDX service manual Checking the Indoor and Outdoor Units

(2)If the self-diagnostics function fails to operate

Check the indoor unit.

Is the fuse blown?

Normal

Replace the controller.

No indicators illuminate and the indoor fan does not rotate.

Check the power voltage.

Blown

Replace the circuit board or the fuse.

10-3. Checking the Indoor and Outdoor Units

(1) Checking the indoor unit

No.	Control	Check items (unit operation)
1	Press EMERGENCY OPERATION button	The rated voltage must be present between inter-unit wirings 1 and 2.
	of main unit controller, or start operation	Connect a 5 kohm resistor between inter-unit cables 2 and 3. When the
	using the remote controller.	voltage at both ends is measured, approximately 12 to 15 V DC must
2		be output and the multimeter pointer must bounce once every 8
	Press and hold the TEST RUN button	seconds.
	on the main unit controller until the buzzer	Or instead of measuring the voltage, you can insert an LED jig and
	sounds 1 time.	check that the LED flickers once every 8 seconds.

If there are no problems with the above, then check the outdoor unit.

(2) Checking the outdoor unit

No.	Control	Check items (unit operation)
1	Apply the rated voltage between outdoor	The control panel LED (red) must illuminate.
	unit terminals 1 and 2.
2	Short-circuit the outdoor unit COM terminal	The compressor and fan motor must turn ON about 5 seconds later
	to the T-RUN terminal.	after the terminals are shorted.

If there are no problems with the above, then check the indoor unit.

TEST/MV T-RUN terminals

Using the TEST/T-RUN terminals

T-RUN : Test run (compressor and fan motor turn ON).

TEST/MV : Compresses time to 1/60th (accelerates operation by 60 times faster than normal). Fully opens the electric expansion valve.

Circuit board

TEST/MV T-RUN COM

(3) Checking the serial communications

		Control 1			Control 2			.... OFF	.... Blinking	.... Illuminated
Initial self-diagnostics			Short-circuit terminals 2 and 3 on			Short-circuit terminals 2 and 3 on
			the indoor unit terminal plate.			the outdoor unit terminal plate.
									Probable location of malfunction
Ion	Timer	Operation	Ion	Timer	Operation	Ion	Timer	Operation
( 3 )	( 2 )	( 1 )	( 3 )	( 2 )	( 1 )	( 3 )	( 2 )	( 1 )
									Indoor unit circuit board failure
									Outdoor unit circuit board failure
									Failure (open circuit, contact failure, etc.)
									in the inter-unit wirings
									Outdoor unit circuit board failure

Turn the power OFF before performing short circuiting work.

During the self-diagnostics check, the check results are the first indication when the TEST RUN button is pressed until the buzzer sounds 1 time, after the power supply is ON.

So that the check can be made quickly, indicators blink at first communication after power ON.

Before performing the above checks, press the ON/OFF operation button of indoor unit or remote controller to operate the air conditioner, and check that AC 220 to 240V is output to terminals 1 and 2. If it is not output, there is a failure related to the indoor unit power.

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