Lincoln 1457 S/N N31349 and, Above, A pre-purgetime of 30 to 60 seconds occurs after, Main fan

		not stay on, check the reset button for the ignition
		control. If the above check okay, replace ignition control.
Oven will not heat	Main fan	If not operating, refer to “Oven fan will not run”
S/N N31349 and
Above
	Gas supply	Check for adequate gas supply and be sure that the
		manual gas shut off valve is open. Also check flexible
		gas line connection..
	Air pressure switch	Check air switch terminals for supply voltage to
		terminals COM and NO. If voltage is present on one side
		only, check for air tube blockage or misalignment. If
		these are okay, adjust air pressure switch or replace
		switch as needed.
	Oven cavity hi-limit	Terminals are normally closed, opens at 350°C (660°F).
	thermostat	If open, reset and test oven for proper operation. If
		thermostat will not hold for maximum temperature, and
		oven is not exceeding control setting, check for proper
		location of the capillary bulb in its spring holder. If above
		checks are okay, replace hi-limit thermostat.
	Ignition control	Check for supply voltage to ignition control at terminal
		#1 and neutral. If no voltage is present, trace wiring back
		to hi-limit thermostat. If voltage is present, check for
		supply voltage to burner blower motor at terminal #8 and
		neutral. If no voltage is present, wait 30 seconds, reset
		ignition control, and re- try. If the above fails, replace
		ignition control.
	Burner reset switch	Switch is normally open. Check to see that the switch
		closes when reset button is pushed. Replace as needed.
	Burner blower motor	Check for supply voltage to burner blower motor. If no
		voltage is present, trace wiring back to the ignition
		control.
		WITH POWER OFF: Turn blower wheel to check for
		locked rotor.
		If supply voltage is present and motor does not run,
		replace burner blower motor.
	Burner blower motor air	Check for air pressure switch to be switching from “NC”
	pressure switch	to “NO”. Check for air tube blockage or misalignment.
		Adjust air pressure switch. If the above fails, replace air
		pressure switch.
	Ignition control	A pre-purge time of 30 to 60 seconds occurs after
		burner blower motor starts. Check for high voltage spark
		output from the ignition control. If there is no high
		voltage spark output, check reset button for the ignition
		control. If there is still no high voltage output, replace the
		ignition control.
	Igniter/sensor assembly	Check for visible damage to the igniter/sensor assembly.
		If there is visible damage to the igniter/sensor assembly,
		replace. If there is no visible damage to the components,
		and no spark, replace the igniter/sensor assy. Also
		check for frayed or damaged wires in burner tube.
		Replace components as needed.
	Ignition control	Gas valve should open as the ignition control generates
		the high voltage spark. Check for supply voltage to pilot
		valve at terminal #5 and neutral. If no voltage is present,
		check reset button for the ignition control. If there is still
		no voltage to the pilot valve, replace ignition control.
	Gas valve	Check for supply voltage to pilot valve terminal #5 to
		neutral, if there is no voltage, trace wiring back to
		ignition control. If there is supply voltage, connect a
		manometer to the pressure tap fitting on the gas valve. If

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