Vulcan-Hart VCE10H 126178 Electric Combi Ovens - Troubleshooting, Symptom, Possible Causes

ELECTRIC COMBI OVENS - TROUBLESHOOTING

SYMPTOM		POSSIBLE CAUSES
Temperature display for cavity or cooking	1.	Cavity temperature probe (thermocouple) shorted.
probe does not change after starting a cook	2.	Oven cavity not heating - check incoming voltage.
cycle.	3.	Contactor(s) malfunction. See “HEATING MODE AND
		CAVITY FAN SPEEDS” under “ELECTRICAL
		OPERATION”.
	4.	Heating element(s) inoperative.
Cooking probe temperature displays “32” in	1.	Product temperature is below 35°F. Once product warms,
the time display. After approximately 10		correct temperature will display.
minutes, “00"or “32” flashes and the buzzer	2.	Cooking probe.
sounds intermittently. Oven will not operate		A. Damaged probe or thermocouple lead wire open.
in probe mode.
		B. Board connection loose or connector not inserted
		onto board properly (mis-aligned).
		C. Thermocouple lead wires reversed. When heating,
		cavity temperature will appear to decrease for
		several seconds, then “32" will display.
	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.)
Temperature display flashes current cavity	1.	Door not completely shut or handle not in the closed
temperature but oven will not heat or		position.
produce steam.	2.	Door reed switch malfunction.
	3.	Oven control board malfunction.
Cavity cooking temperature is lower than	1.	Cavity temperature probe(s) (thermocouple) shorted.
actual temperature displayed.	2.	Incorrect temperature probe in use.
		A. Cavity thermocouple not the correct type.
		B. 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.
	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”.
Button(s) on keypad inoperative	1.	Display/Keypad board malfunction. Verify keypad is
(programmable control).		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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