Hoshizaki JWE-620UA-6B service manual Error Code Log

Error	Problem	Operation	Reset
Code
	Internal Booster Tank Thermistor Error	Normal	After replacing failed component,
	(open)	(internal	alarm resets.
H4		booster tank
	Thermistor senses abnormal temperature	heaters off)
	(at (heater off) or below -6°F (-21°C)).
H5	ROM/RAM Error	Unit stops	After replacing control board, alarm
	Control board ROM/RAM fails.		resets.
	EEPROM Error	Unit stops	After replacing control board, alarm
H6	EEPROM fails.		resets.
	Phase Reversal Error	Unit stops	After correcting the connection by
H7			swapping two of three wires at the
	Power supply phase is reversed.		power switch (GFCI) connection,
			alarm resets.

2. Error Code Log

Use the "ON/OFF" button to turn off the unit. Press and hold the "MODE" button, then press the "ON/OFF" button. "01" should appear on the display. Use the down arrow button to scroll to service menu items 21 through 25 (Auxiliary Code U-1, U-2, U-3, V-0, A-0) or 26 through 30 (Auxiliary Code A-1 and later). 21 (Auxiliary Code U-1, U-2, U-3, V-0, A-0) or 26 (Auxiliary Code A-1 and later) is the most recent error. Press the "MODE" button to view the selected service menu item. Press the "MODE" button once again to return to the main service menu list. If no errors exist in the log, "--" is displayed.

Press the "STANDBY/CLEANING" button to exit the service menu. The display goes blank.

To erase the log, press and hold the up and down buttons for 3 seconds with one of the error codes displayed. The unit beeps once and the entire log clears.

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