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h) ROM/RAM Error (H5)
• If a ROM/RAM error is detected, the unit shuts down, "H5" appears in the display, and the
buzzer sounds.
• After replacing the failed component, the alarm resets.
• See the chart below for possible causes and remedies.
i) EEPROM Error (H6)
• If an EEPROM error is detected, the unit shuts down, "H6" appears in the display, and the
buzzer sounds.
• After replacing the failed component, the alarm resets.
• See the chart below for possible causes and remedies.
Note: See “IV.I. Removal and Replacement of Control Board or Operation Board.”
Control Board
Defective. Replace.
ROM/RAM on control board fails.
H 5
Code Error
Item Possible Cause Remedy
Unit stops.
Operation
EEPROM on control board fails.
H 6
Code Error
Item Possible Cause Remedy
Unit stops.
Operation
Control Board
Defective. Replace.