Lincoln 1434-000-E, 1457, 1433-000-E, 1456 There is voltage to the pilot valve, but there is no gas

		there is voltage to the pilot valve, but there is no gas
		pressure, replace gas valve.
	Pilot tube	Check for gas pressure at pilot tube. Disconnect pilot
		tube at burner and connect manometer. If there is no
		gas pressure, check for blockage in pilot tube. Repair or
		replace as needed.
	Pilot orifice	If there is gas pressure at the pilot tube, check the pilot
		orifice for damage or obstructions. Replace pilot orifice
		as needed.
Flame will not stay on	Flame sensor	To check flame sensor operation, connect a digital
		multimeter (capable of measuring D.C. microamps)
		between the flame sensor wire and the flame sensor
		connection on the ignition control (terminal #13). Flame
		sensor current is to be 0.7 microamps, minimum. If
		these readings are not achieved, replace igniter/sensor
		assembly. Also check for any type of damage to flame
		sensor wire and connections.
		NOTE: The D.C. microamp test must be conducted with
		the oven in low flame (bypass) operation.
	Power supply	Set the temperature to the lowest temperature setting. If
		there is sufficient microamp current, but the flame will
		not stay lit, check for proper polarity of the power supply.
	Ignition control	If there is sufficient microamp current, and there is
		proper polarity of the power supply, but the burner will
		not stay lit, check the reset button for the ignition control.
		If the above test is okay, replace the ignition control.
	NOTE: Flame should be on at
	this time
Low flame is on, but	Control transformer	Check for supply voltage to primary of control
no main flame		transformer. If no voltage is present, trace wiring back to
		oven power switch. If voltage is present, check for
		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 ignition control. 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 temperature regulation valve. If there is
		voltage at the temperature regulation valve, proceed to
		“Temperature regulation valve “. If there is no voltage at
		the temperature regulation valve, 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
	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.

Impinger I – Adv Digital – Gas Service Manual – International 9