Sanyo SAP-KRV123EH If self-diagnostics function fails to operate, Checking the outdoor unit

■If 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.

<Checking the indoor and outdoor units>

■Checking the indoor unit

No.	Control	Check items (unit operation)
1	Use the remote controller to operate the	• The rated voltage must be present between inter-unit cables 1 and 2.
	unit in “TEST run” mode. To determine	• Connect a 5 kΩ resistor between inter-unit cables 2 and 4. When the
	whether the mode is currently in “TEST run”	voltage at both ends is measured, approximately 12–15 V DC must
	mode, check the 3 indicator lamps on the	be output and the multimeter pointer must bounce once every 8
	unit. If all 3 are blinking, the current mode is	seconds.
	“TEST run.”	Or instead of measuring the voltage, you can insert an LED jig and
		check that the LED flickers once every 8 seconds.

●For the “Test run” procedure, refer to 7.4 “How to Test Run the Air Conditioner.”

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

■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, fan motor, and 4-way valve must all turn ON.
	to the T-RUN terminal.

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

● Using the TEST/T-RUN terminals				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).
■ Checking serial communications				(TEST)/MV T-RUN COM
		→ Control 1	→ Control 2
Initial self-		Short-circuit terminals 2 and 4 on	Short-circuit terminals 2 and 4 on	Probable location of malfunction
diagnostics		the indoor unit terminal base.	the indoor unit terminal base.
		No change		Indoor unit circuit board failure
(1) illuminates		Change: (1) and (3) illuminate,	Change: (1) and (3) illuminate,	Outdoor unit circuit board failure
		and (2) blinks.	and (2) blinks.
		Change: (1) and (3) illuminate,	Change: (1) illuminates	Failure (open circuit, contact failure, etc.)
		and (3) blinks.		in the inter-unit wiring
(1) and (3) illuminate,				Outdoor unit circuit board failure
and blinks.

●Turn the power OFF before performing short circuiting procedures.

●Refer to the previous pages when performing system self-diagnostics.

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

●Before performing the above checks, perform “TEST run” operation, and check that the rated voltage is output to terminals 1 and 2 on the outdoor unit. If it is not output, there is a failure related to the indoor unit power.

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