Mitsumi electronic PKA-A12HA4, PKA-A18HA4 service manual Troubleshooting

9 TROUBLESHOOTING

9-1. TROUBLESHOOTING

<Error code display by self-diagnosis and actions to be taken for service (summary)>

Present and past error codes are logged and displayed on the wired remote controller or controller board of outdoor unit. Actions to be taken for service and the trouble reoccurrence at field are summarized in the table below. Check the contents below before investigating details.

Unit conditions at service	Error code	Actions to be taken for service (summary)
	Displayed	Judge what is wrong and take a corrective action
		according to “9-3. Self-diagnosis action table”.
The trouble is reoccurring.
	Not displayed	Conduct troubleshooting and ascertain the cause of the
		trouble according to “9-4. Troubleshooting by inferior
		phenomena”.
		Consider the temporary defects such as the work of
		protection devices in the refrigerant circuit including
		compressor, poor connection of wiring, noise and etc.
		Re-check the symptom, and check the installation
		environment, refrigerant amount, weather when the
	Logged	trouble occurred, matters related to wiring and etc.
		Reset error code logs and restart the unit after finishing
		service.
		There is no abnormality in electrical component,
The trouble is not reoccurring.		controller board,remote controller and etc.
		Re-check the abnormal symptom.
		Conduct trouble shooting and ascertain the cause of the
		trouble according to “9-4. Troubleshooting by inferior
	Not logged	phenomena”.
		Continue to operate unit for the time being if the cause
		is not ascertained.
		There is no abnormality concerning of parts such as
		electrical component, controller board, remote controller
		and etc.

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