Lincoln 1454-000-E transformer, Oven control, manual for temperature adjustment. With the oven

			24VAC at transformer secondary. If there is primary
			voltage, but no secondary voltage, replace control
			transformer.
		Oven control	Check for 24VAC supply to oven control. If no voltage is
			present, trace wiring back to control transformer. Check
			for supply voltage to oven control. If no voltage is
			present, trace wiring back to hi-limit thermostat. If
			voltage is present, check for a read-out on the display. If
			there is no read-out on the display, replace oven control.
			If there is a read-out on the display, set the oven control
			to maximum temperature (see installation operations
			manual for temperature adjustment). With the oven
			control at maximum temperature, check for supply
			voltage to the heat contactor. If there is voltage at the
			heat contactor, proceed to “Heat contactor “. If there is
			no voltage at the heat contactor, trace wiring back to the
			oven control. If there is no voltage output at the oven
			control, check the read-out on the oven control. If the
			oven control reads “PROBE FAIL” this indicates that the
			thermocouple has failed or become disconnected from
			the oven control
		Contactor, hi-limit (Model	Check for supply voltage to contactor coil. If no voltage
		1421-000-E only)	is present, trace wiring back to oven cavity hi-limit
			thermostat. If supply voltage is present at the coil, check
			to see that contacts are closed. If there is voltage to the
			coil and the contacts are not closed, replace contactor.
		Thermocouple	Check to see that the thermocouple is securely
			connected to the oven control. If the thermocouple is
			connected to the oven control, and the display indicates
			“PROBE FAIL”, disconnect the thermocouple from the
			oven control and measure the resistance of the
			thermocouple. The thermocouple should read approx.
			11Ω. If these readings are not achieved, replace the
			thermocouple. If these readings are correct, proceed.
		Oven control	If the thermocouple checks good, but the oven control
			display indicates that there is a thermocouple failure,
			replace the oven control. If the oven control indicates a
			temperature reading, but the oven will not heat, proceed.
		Thermocouple	WITH POWER ON AND THERMOCOUPLE
			ATTACHED TO THE OVEN CONTROL: Measure the
			DC millivolt output of the thermocouple. Refer to the
			thermocouple chart (located in the “Removal” section of
			the manual) for proper millivolt readings. If these
			readings are not achieved, replace thermocouple.
		Oven control	If the thermocouple checks good, but there is no supply
			voltage output to the temperature regulation valve,
			replace the oven control. If there is supply voltage output
			to the heat contactor, proceed.
		Heat contactor	Check for supply voltage to the heat contactor. If voltage
			is present, listen for contacts to open and close. Also
			check for opens or shorts in the operating coil. Replace
			heat contactor as needed.
	Intermittent heating	Thermal/overload of main fan	The main fan motor is equipped with internal thermal
		motor	protection and will cease to operate if overheating
			occurs. As the motor overheats and cool, this will cause
			the heating system to cycle on and off intermittently.
			Improper ventilation or lack of preventive maintenance
			may cause this problem. Also most of the problems
			listed under “Oven will not heat” can cause intermittent
			failure.
	Conveyor will not run	Incoming power supply	Check circuit breaker, reset if required. Check power
Impinger I -–Adv Digital – Electric Service Manual - International				7