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5. Remove kettle thermistor and allow to
cool. Remove edge connector from
control box. Test resistance across edge
connector's pins #2 and #7. Is it
approximately 100,000 ohms?
6. Turn the potentiometer on the control box
clockwise to increase the maximum
operating temperature. Does the kettle
now achieve maximum operating
pressure of 30-35 psi in an empty kettle?
No Replace defective thermistor
Yes Kettle is operating correctly.
No Spray contact cleaner on control
terminals and edge connector. Try box
again. If problem still exists, replace
defective control box.
Fault Isolation Pr
ocedure
Step Test
1. Does the green LED turn off even though
the contactors remain energized?
2.
Unplug the control box and measure the
resistance across the potentiometer (temperature
control), Is the resistance approximately 0 ohms at
maximum and 50,000 ohms at minimum setting?
3. Remove kettle thermistor and allow to cool
Remove edge connector from control box.
Test resistance across edge connector’s
pins #2 and #7. Is it approximately 100,000
ohms?
4. Turn the potentiometer (temperature
control) on the control box counter-
clockwise to decrease the maximum
operating temperature. does the kettle
continue to overheat?
Result Remedy
Yes Replace defective 12 VDC relay.
No Go to step #2.
Yes Go to step #3.
No Replace defective thermistor.
Yes Go to step #4.
No Replace defective thermistor.
Yes
Spray contact cleaner on control box terminal
and edge connector. Try box again. If problem
still exists, replace defective control box.
No Kettle is operating correctly.
Possible Causes
1. Defective thermistor
.
2. Defective potentiometer
(temperature control).
3. Defective 12 VDC relay.
4. Defective control box.
C/ Problem: Kettle is overheating.
Fault Isolation Procedure
Step Test
1. Remove wire from low water level probe
and ground the wire to the body of the
kettle. Does the red LED turn off?
Result Remedy
Yes Replace or clean defective low water
level probe.
No Spray contact cleaner on control box
terminals and edge connector. Try box
again. If problem still exist, replace
defective control box.
Possible Causes
1. Defective low water level probe
2. Defective control box.
D/ Problem: Red LED remains illuminated even though water has been added.