Lincoln 1400 Series service manual

Gas Pressure Switch	This switch is located inside the gas valve and should
	close when gas pressure is present. WITH POWER
	OFF: remove 3 prong plug (on gas valve) and
	measure continuity between terminals 2 and 3.NOTE:
	Remove insulation pad below plug to read numbers. If
	no continuity, check the following:
	1. Proper gas pressure supply to the gas valve as
	marked on the oven specification plate.
	2. Check for proper adjustment of gas pressure
	switch. 8.8 on dial for natural gas, 23 for LP, and 4.5
	for Town Gas.
	3. Check gas filter in gas valve for blockage or
	damage. (See Adjustment Section on page 28). If
	above checks are okay, but pressure switch is still not
	closed, replace gas valve.
Hi-Limit Thermostat	Thermostat is normally closed, opens at 368°C
	(695°F). If open, reset and test oven for proper
	operation. If thermostat will not hold for maximum
	oven temperature, and oven is not exceeding
	temperature dial setting, check for proper location of
	capillary bulb in its spring holder. If above checks
	okay, replace hi-limit thermostat.
Ignition Control	Check for proper line voltage supply to ignition control,
	terminal #1.Check for proper line voltage to the Burner
	Blower Motor. If voltage is present, proceed with next
	step, if not, wait 30 seconds, push reset button, and
	try to restart. If this fails, check wires from thermostat
	and burner blower motor to the ignition control. If all
	above fails and wires are okay, replace ignition
	control.
Burner Blower Motor	Check for line voltage to motor. WITH POWER OFF:
	turn blower wheel to check for locked rotor or blower
	wheel slippage. If proper line voltage is present at
	motor connecting plug, terminal 2 and 5, and motor
	does not run, replace motor.
Air Pressure Switch (Burner	Check for proper line voltage switching from "N.C." to
Blower)	"N.O." as air pressure switch closes. Check for air
	switch adjustment, air tube blockage, or misalignment,
	and if these fail, replace air pressure switch.
Spark Generator	A pre-purge time of 30 to 60 seconds occurs after
	blower motor starts, check for proper line voltage at
	spark generator. If voltage is not present, check reset
	button for the Ignition Control. If voltage is still not
	present, replace ignition control. If voltage is present,
	visually check for spark at igniter head located in end
	of burner.
Igniter/Sensor Assembly	Check this assembly for visible damage. If there is no
	damage, replace the spark generator. If there is
	damage, replace the Igniter/Sensor Assembly. Also
	check for frayed or damaged wires in the burner tube.
	Check spark gap (should be .100 inch 2.5 mm).
	Replace as needed.
Gas valve	This solenoid is located inside the gas valve and
	should open when proper line voltage is present. If no
	voltage is present, check the reset button on the
	ignition control, and all connections for tightness. If
	there is still no voltage present at gas valve, replace
	ignition control. If there is voltage present, check for
	gas pressure at the gas pressure tap located in the
	gas piping just prior to the burner. If there is no gas
	pressure, replace gas valve.

Impinger I – 1400 Series Advantage Service Manual – Dom & Int’l 15