■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) |
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1 | Use the remote controller to operate the | • The rated voltage must be present between |
| unit in “TEST run” mode. To determine | • Connect a 5 kΩ resistor between |
| whether the mode is currently in “TEST run” | voltage at both ends is measured, approximately |
| 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 |
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| check that the LED flickers once every 8 seconds. |
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●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. |
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2 | • The compressor, fan motor, and | |
| to the |
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●If there are no problems with the above, then check the indoor unit.
● Using the |
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: Test run (compressor and fan motor turn ON). |
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TEST/MV : Compresses time to 1/60th (accelerates |
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| operation by 60 times faster than normal). |
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■ Checking serial communications |
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| → Control 1 | → Control 2 |
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Initial self- |
| Probable location of malfunction | ||||||
diagnostics |
| the indoor unit terminal base. | the indoor unit terminal base. | |||||
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| No change |
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| Indoor unit circuit board failure | ||
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(1) illuminates |
| Change: (1) and (3) illuminate, | Change: (1) and (3) illuminate, | Outdoor unit circuit board failure | ||||
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| and (2) blinks. | and (2) blinks. |
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| Change: (1) and (3) illuminate, | Change: (1) illuminates | Failure (open circuit, contact failure, etc.) | ||||
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| and (3) blinks. | in the | |||||
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(1) and (3) illuminate, |
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| Outdoor unit circuit board failure |
and blinks. |
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●Turn the power OFF before performing short circuiting procedures.
●Refer to the previous pages when performing system
●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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