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E. Thermistor Check
If the error code “H1” “H2” “H3” or “H4” or an abnormal temperature [above 231°F (111°
C) or below -6°F (-21°C)
] appears in the display, or the wash tank water boils, check the
thermistor(s) according to the procedure below. If replacement is required, see “IV.H.
Removal and Replacement of Thermistor.”
1) Use the “ON/OFF” button on the operation panel to turn off the unit, then turn off the
dishwasher and booster tank power supplies. Lockout/Tagout to prevent the power supplies
from being turned back on inadvertently.
2) Remove the front panel, then pull out the control box.
3) Remove the control box cover, then disconnect the CN7 connector from the control board
(see “II.F.2. Control Board Layout”).
4) To check the wash tank thermistor, check the resistance across the white wires (#1 and
#2). To check the booster tank thermistor, check the resistance across the pink wires (#3
and #4). See the table below for proper resistance and temperature relations.
Temperature [°F (°C)]
Resistance [kΩ]
194 (90)
4.30 to 4.62
176 (80)
5.87 to 6.38
158 (70)
8.13 to 8.96
140 (60)
11.5 to 12.8
104 (40)
24.3 to 28.0
68 (20)
56.3 to 67.1
32 (0)
145.6 to 180.6
5) If any problem is found, replace the thermistor according to “IV.H. Removal and Replacement
of Thermistor.”