10-3. Checking the Indoor and Outdoor Units

(1) 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 wirings 1 and 2.

 

 

unit in "TEST run" mode. To determine

 

Connect a 5 k ohm resistor between inter-unit wirings 2 and 3. When the

 

 

whether the mode is currently in

 

 

 

 

 

 

voltage at both ends is measured, approximately 12 to 15V DC must

 

 

"TEST run" mode, check the 3 indicator

 

 

be output and the multimeter pointer must bounce once every 8

 

 

lamps on the unit. If all 3 are blinking,

 

 

seconds.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

the current mode is "TEST run."

 

 

 

 

 

 

Or instead of measuring the voltage, you can insert an LED jig and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

check that the LED flickers once every 8 seconds.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

For the "Test run" procedure, refer to 7.4" How to Test Run the Air Conditioner".

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(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, 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).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(TEST)/MV

 

T-RUN

 

COM

 

 

(3) Checking the serial communications

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

.... OFF

.... Blinking

 

.... Illuminated

 

 

 

 

Control 1

 

 

 

 

 

 

Control 2

 

 

 

 

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

 

Quiet

 

Timer

Operation

 

Quiet

 

Timer

Operation

Quiet

 

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 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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Sanyo CL1872, C2472 Checking the Indoor and Outdoor Units, Checking the indoor unit Control Check items unit operation

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