Lincoln 1400 Series Flame will not stay on, Flame Sensor, Ignition Control, ignition control

Flame will not stay on	Flame Sensor	To check for flame sensor operation, connect a digital
		multimeter (capable of measuring D.C. micro amps)
		between the flame sensor wire and Ignition Control.
		Sensor current from sensor control is 3 micro amps
		minimum. If these readings are not achieved replace
		igniter/sensor assembly. Also check for any type of
		damage to flame sensor wire and connections.
	Ignition Control	If there is sufficient flame sensor current, but the
		burner will not remain ignited, check the reset button
		on ignition control. If all above are okay, replace
		ignition control.
No Pilot	Pilot Orifice	If all above are operating properly, but there is no pilot
		flame, check for any obstructions in pilot orifice.
Pilot flame, but burner	Flame Sensor	(There should be a visible pilot flame at this time.) To
will not stay ignited		check for flame sensor operation, connect a digital
		multimeter (capable of measuring D.C. micro
		amperes) between the flame sensor wire and the
		ignition control. NOTE: this is a current measurement
		and the meter must be connected in series. Proper
		current readings should be minimum of 3 micro AMP.
		D.C. If these readings are not achieved, replace
		igniter/sensor assembly. Also check for any type of
		damage to flame sensor wire and connections.
	Power Supply	If there is sufficient micro-amp current, but the flame
		will not stay lit, check for proper polarity of the input
		power supply.
	Ignition Control	If there is sufficient flame sensor current, but the
		burner will not remain ignited, check reset button on
		ignition control, if all above are okay, replace ignition
		control.
Indicator light is on,	Gas Control Relay	Check for 220 VAC to relay coil. If no voltage is
but no main		present, trace wiring back to ignition control. If voltage
flame(Model 1456-		is present, check to insure contacts are closing.
1457)	Temperature Control	Check for 120 VAC across L1 and L2 on temperature
		control board. If no voltage is present, retrace wiring
		back to power supply. Turn the temperature
		adjustment knob to the maximum temperature
		position and check for 120 VAC at the load terminal to
		neutral. If 120 VAC is not present, proceed as
		follows: If 120 VAC is present and unit is not heating,
		see "Solenoid Valve."
	Thermocouple Probe	Remove thermocouple leads from the temperature
		control board and measure the millivolt output of these
		leads. Refer to chart in page 25 for proper readings.
		If the thermocouple probe checks good, then the
		problem is usually with the temperature control board.
	Solenoid Valve	If output voltage is present at temperature control
		board, check for voltage at solenoid valve. If voltage
		is present, listen for valve to open and close. Also
		check for opens, shorts in coil. Replace as needed.
Indicator light is on,	Temperature Control	Check for 120 VAC across L1 and L2 on temperature
but no main flame		control board. If no voltage is present, retrace wiring
(1474-1475-1476)		back to power supply. Turn the temperature
		adjustment knob to the maximum temperature
		position and check for 220 VAC at the load terminal
		to neutral. If 220 VAC is not present, proceed as
		follows: If 220 VAC is present, and unit is not heating,
		see "Flame Monitor". Check for 220 VAC at terminal
		"COM" on temperature control board. If no voltage is
		present, trace wiring back to ignition control.

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