Dry System; Introduction And Operation - Haier GE GDF510P M4 Series Service Manual

Introduction and 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, then exiting through the vent. Some models
have a fan assist dry cycle.
During dry, the heat element cycles after an initial 7-minute on time to 1 minute off, 2 minutes on for
27 minutes and a 14-minute cool down. During a normal cycle with no wash boost options selected.
Boost wash options will change the time needed due to hotter temperatures in rinse for options and
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.

Dry System

Heater Algorithm, Dry Cycle
Normal with Heated Dry
Time Calrod Description
(minutes)
7 Calrod on
27 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 - 1 minute on/1 minute off
Boost Dry Option
7 Calrod on
57 Calrod Pulse - 2 minute on/1 minute off
15 Calrod off - Cool Down
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