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Dry System
Introduction Operation
The dual wattage Calrod heater serves both to heat the water during a wash cycle and to heat the air
during the dry cycle. Heat and air circulation are required for good dry performance. Air circulation is
natural convection with air entering through the fill funnel.
During a dry cycle, the heat element cycles after an initial 7-minute ON time to 1 minute OFF, 2 minutes
ON for 33 minutes and a 14-minute cool down. Boost wash options will change the time needed due
to hotter temperatures in rinse for options and the cycle selected. The table below represents a normal
cycle with heated dry option only selected.
Dual wattage occurs due to the heat level in the element raising the resistance of the internal element.
As water quenches the heat on the case, resistance lowers, and wattage rises.
The tub TCO has been removed. The machine control board now monitors the heater relay. If the
board sees the heater relay closed when it should be open, it will try to open the relay 20 times in 20
seconds. If unsuccessful, the dishwasher will drain and then will terminate the cycle. Resetting the
power or entering and exiting Service Mode will reset the fault. The dishwasher can then be started
again. The machine control will fault out again after 20 seconds if it still sees the heater relay closed.
Replace the machine control board if the fault continues.
Heater Algorithm, Dry Cycle
Normal with Heated Dry
Time
Calrod Description
(minutes)
7
Calrod on
33
Calrod Pulse - 2 minute on/1 minute off
14
Calrod off - Cool Down
Normal with Temp Boost or Steam/Sani Selected
7
Calrod on
57
Calrod Pulse - 2 minute on/1 minute off
Normal with Boost Dry
7
Calrod on
57
Calrod Pulse - 2 minute on/1 minute off
15
Calrod off - Cool Down
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