Sanyo UHX3652, UHX2452 E16 Alarm Alarm code, At a number of indoor units, E20 Alarm Alarm code

Trouble Diagnosis

3. W-2WAY ECO-i Alarm Codes

E16 Alarm

Alarm code	E16
Alarm meaning	Automatic address setting alarm (too many units)
Alarm conditions	There were a number of indoor units was too many when Automatic address setting was performed
	at a number of indoor units.
	After initial communications were completed, an unrecognized unit was detected.
Probable cause	(1) The SW for setting the number of indoor units is incorrect.
	(2)	The inter-unit control wiring is wired incorrectly.
Check	(1) Refer to the test run servicing materials and check the number of indoor units that is set.
	(2)	Check the inter-unit control wiring at the indoor and outdoor units.
Correction	After correcting the indoor unit quantity setting or the inter-unit control wiring, perform automatic
	address setting again.
Example	—
Notes	—
E20 Alarm
Alarm code	E20
Alarm meaning	No indoor units at automatic address setting.
Alarm conditions	When automatic address setting was performed, no indoor units were recognized.
Probable cause	(1)	The inter-unit control wiring from the outdoor unit to the indoor units has been cut.
	(2)	Serial connector (OC: CN001) is disconnected at the outdoor unit.
	(3)	The power is OFF at all indoor units in the system.
Check	(1)	Check whether the inter-unit control wiring from the outdoor unit to the indoor units is cut.
	(2)	Check whether serial connector (OC: CN001) is disconnected at the outdoor unit.
	(3)	Check the power at the indoor units.
Correction	(1)	Reconnect the inter-unit control wire from the outdoor unit to the indoor unit.
Example	—
Notes	Position of serial connector (OC: CN001) on W-2WAY control PCB

CN001

E24 Alarm

Alarm code	E24
Alarm meaning	Outdoor unit (main) failed to receive signal from other outdoor unit (sub).
Alarm conditions	After initial communications were completed, communications from an outdoor unit stopped.
Probable cause	(1) After initial communications were completed, the outdoor unit main/sub control wiring was cut.
	(2) After initial communications were completed, the outdoor unit power was turned OFF.
Check	—
Correction	—
Example	—
Notes	—

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