A heater fault detection program has been added to the
electronic control to check for temperature rise and shut
down the dishwasher if a temperature rise is not detected.
The cycles have been modified to add 8 minutes 45
seconds of fixed heat at the beginning of the main wash.
The control looks for the temperatures at the thermistor to
increase 4 degrees with cooler (roughly <110° F) inlet water
and 2 degrees when there is hot (roughly >110° F) inlet
water. If the temperature rise is less than the criteria, then
the unit will drain and blink the clean light 7 times. The
detection will be ignored if the temperature is out of its
normal range, 64° - 160° F, or the door is opened during
the fixed heat.
Proper incoming water temperature should be between 120°
- 140° F.
Possible causes of insufficient temperature rise would
include wires off at the control, heating element, thermistor,
inlet valve, door switch, motor or capacitor, failure of any
of the above components or siphoning of the water during