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6-15
Technician Troubleshooting Guides (Continued)
Before performing the following checks, disconnect the unit from the
electrical power source and check all wiring connections involved to
ensure they are secure.
Each of the following checks is to be performed with the unit connected to the
electrical power supply, with the controller on and calling for heat, and with
enough water in the cookpot to cover the lower water level sensor.
TROUBLESHOOTING
THE CONTACTOR
COIL
Is 24VAC
present at pin 4 of the 15-
pin plug when controller is
calling for heat?
Probable cause is
failed controller.
No
Is button in the
center of the contactor
block depressed?
Contactor coil is
OK. Element has
failed. Replace.
Yes Yes
Contactor coil has
failed. Replace.
No
TROUBLESHOOTING
THE TEMPERATURE
PROBE
What is the
problem?
Water boils in
simmer mode.
Water temperature
is too low in
simmer mode.
Check for shorted probe circuit.
Probe voltage at pin 13 should be:
Approx 1.8VDC @ 60ºF (16ºC)
Approx 2.0VDC @ 100ºF (38ºC)
Approx 2.5 VDC @ 212ºF (100ºC)
Probe resistance should be:
Approx 552 ohms @ 60ºF (16ºC)
Approx 655 ohms @ 100ºF (38ºC)
Approx 1000 ohms @ 212ºF (100ºC)
TROUBLESHOOTING
THE HIGH-LIMIT
THERMOSTAT
Is 24VAC
present at the C
terminal of the
high-limit?
High-limit has
failed. Replace.
High-limit is OK.
Yes
No
Are readings
within
specifications?
Probe is shorted.
Replace.
Check continuity
of probe.
Continuity OK?
Probe is OK.
Calibrate
controller.
Yes Yes
No
Probe is open.
Replace.
No