Sanyo DHX3652, UHX2452, UHX0752 H31 Alarm Alarm code, L04 Alarm Alarm code, L05 Alarm Alarm code

1

2

3

4

5

6

7

8

Trouble Diagnosis

3. W-2WAY ECO-i Alarm Codes

H31 Alarm

Alarm code	H31
Alarm meaning	HIC trouble alarm
Alarm conditions	This alarm occurs when the microcomputer identifies a trouble signal (indicating abnormal HIC
	temperature or other trouble) from the HIC.
	The HIC judges the current and temperature, and outputs the trouble signal. In general this
	indicates trouble with the HIC itself.
Probable cause	Overcurrent in HIC circuit, and resultant abnormal heating, caused by HIC failure
Check	Check the power wiring and connector wiring. If the wiring and connectors are normal, use a
	tester to measure the resistance between the compressor HIC power (HIC+) and ground (HIC–).
	If there is a short circuit, there is an HIC malfunction.
	HIC -	HIC +

	HIC PCB
Correction	If an HIC failure is found, replace the PCB.
Example	—
Notes	Turn OFF the power, and check the continuity of HIC+ and HIC– on the HIC PCB.
L04 Alarm
Alarm code	L04
Alarm meaning	Outdoor unit refrigerant system address duplication
Alarm conditions	Communication by inter-unit control wiring was received that contained the same address as that
	unit 5 times or more within 3 minutes.
Probable cause	Incorrect outdoor system address settings
Check	Check the system address settings again.
Correction	Correct the system address settings.
Example	—
Notes	Recovery from this alarm occurs automatically (when communication that contains the same
	address as that unit is not received for 3 minutes after detection).
L05 Alarm
Alarm code	L05
Alarm meaning	Duplicated indoor unit priority (alarm at priority indoor units)
Alarm conditions	Multiple indoor units set as the priority unit were detected.
Probable cause	More than one indoor unit is set as the priority unit.
Check	From the wired remote controller, use the indoor unit EEPROM simple settings mode and
	check whether or not the value for item code 04 is “0001.”
Correction	If the value of indoor unit EEPROM item code 04 is incorrect, set the correct value from the
	wired remote controller.
Example	—
Notes	This alarm is displayed at the indoor units which are set as the priority unit. At indoor units which
	are not set as the priority unit, alarm L06 is displayed.
	3-16