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g) Booster Tank Thermistor Error (H3, H4)
• If the booster tank thermistor senses a temperature at or above 231°F (111°C) (2.4kΩ), the
thermistor leads are considered shorted and the booster tank heaters de-energize, "H3"
appears in the display, and the buzzer sounds.
• If the booster tank thermistor senses a temperature at or below -6°F (-21°C) (517kΩ),
the thermistor leads are considered open and the booster tank heaters de-energize, "H4"
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: The auto fi ll cycle and the wash/rinse cycle will start even after this error occurs.
Note: See “III.E. Thermistor Check” and “IV.H. Removal and Replacement of Thermistor.”
Control Board
Connector not properly
connected.
Reconnect.
Thermistor
Connector not properly
connected.
Reconnect.
Open circuit (H4). Replace.
Thermistor senses abnormal temperature.
H 3 / H 4
Code Error
Item Possible Cause Remedy
Continues (booster
tank heater off).
Operation
Short circuit (H3). Replace.
Defective. Replace.
Defective. Replace.