Vulcan-Hart VCE10F 126179 Service Manual page 66

SYMPTOM
Temperature display for cavity or cooking
probe does not change after starting a cook
cycle.
Cooking probe temperature displays "32" in
the time display. After approximately 10
minutes, "00"or "32" flashes and the buzzer
sounds intermittently. Oven will not operate
in probe mode.
Temperature display flashes current cavity
temperature but oven will not heat or
produce steam.
Cavity cooking temperature is lower than
actual temperature displayed.
Button(s) on keypad inoperative
(programmable control).
ELECTRIC COMBI OVENS - TROUBLESHOOTING
1. Cavity temperature probe (thermocouple) shorted.
2. Oven cavity not heating - check incoming voltage.
3. Contactor(s) malfunction. See "HEATING MODE AND
CAVITY FAN SPEEDS" under "ELECTRICAL
OPERATION".
4. Heating element(s) inoperative.
1. Product temperature is below 35°F. Once product warms,
correct temperature will display.
2. Cooking probe.
A.
B.
C.
3. Incorrect cooking probe in use. Ensure the cooking probe
is not a thermistor type by checking its resistance. If
resistance measures approximately 110 ohms at 70-80°F
then do not use.)
1. Door not completely shut or handle not in the closed
position.
2. Door reed switch malfunction.
3. Oven control board malfunction.
1. Cavity temperature probe(s) (thermocouple) shorted.
2. Incorrect temperature probe in use.
A.
B.
3. Software revision level not current. Determine the current
version and obtain an update if available. See
"CONFIGURATION MODE - PROGRAMABLE
CONTROL" or "CONFIGURATION MODE - MANUAL
CONTROLS" under "SERVICE PROCEDURES"AND
ADJUSTMENTS".
1. Display/Keypad board malfunction. Verify keypad is
functioning properly. See "DIAGNOSTIC TEST MODE" -
PROGRAMABLE CONTROL" under "SERVICE
PROCEDURES AND ADJUSTMENTS".
2. If keypad test is inaccessible, the oven control board may
not be properly mounted to the front panel. If the
mounting washers are stacked too high or the weld studs
have excessive flash, the oven control board will be
positioned to far from the keypad to actuate the buttons
when pressed.
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POSSIBLE CAUSES
Damaged probe or thermocouple lead wire open.
Board connection loose or connector not inserted
onto board properly (mis-aligned).
Thermocouple lead wires reversed. When heating,
cavity temperature will appear to decrease for
several seconds, then "32" will display.
Cavity thermocouple not the correct type.
Ensure the temperature probe is not a thermistor
type by checking its resistance. If resistance
measures approximately 110 ohms at 70-80°F then
do not use.