To Access Main Control Board; Thermistor - Haier GE GDF450P R0 Series Technical Service Manual

To Access Main Control Board

To Access Main Control Board
1. Remove power to the dishwasher.
2. Remove the toe kick panel.
3. Remove the junction box cover.
4. Remove the 1/4-inch hex-head screw on
control box.
5. Pull down on the bottom cover at the front
of the control box. While pulling down on
the front of the bottom cover, slide the cover
forward to clear the back lip and junction box
bracket.
6. Pull cover and control forward, taking care not
to damage the board or the wiring.
7. To remove the control board from the bottom
cover, remove the ground screw and release
the standoffs.
8. Use care when reinstalling the main control
board to prevent wire pinching. Make sure
the harnesses are routed properly, through
the access ports in the control area and
above the sump hoses to keep them from
snagging on the floor.
9. All ground screws must be reinstalled.

Thermistor

The thermistor monitors water temperature in the
tub. If the thermistor opens or shorts it will cause
an error (see Error Mode section of this service
guide). If it fails in open or shorted, the control
will default to the longest time algorithm.
Thermistor Specifications
VOLTAGE RESISTANCE TEMPERATURE
.95
1.56
2.25
2.91
3.48
3.91
To check the thermistor, access the Main Control
(see Main Control Board in the Structure
section of this service guide), check resistance on
connector J603 pin 3 (brown) to J603 pin 4 (red).
The sensor may also be removed, and the two
outside terminals may be checked. Use the table
above to calculate the correct resistance reading.
Brown
J603-3
– 44 –
20066 50°F
10450 75°F
5824 100°F
3411 125°F
2081 150°F
1330 175°F
Red
J603-4
Thermistor