Sigma 1434-000-E WITH POWER OFF Remove 3 prong plug on gas, Ignition control, ignition control

		WITH POWER OFF: Remove 3 prong plug (on gas
		valve) and measure continuity between terminals 2 and
		3. If no continuity, check the following: Proper gas
		pressure supply to gas valve as marked on the oven
		specification plate. Check for proper adjustment of the
		gas pressure switch, 10 for Nat. gas, 27 for LP gas or
		4.5 for town gas. Check the filter in the gas valve for
		blockage or damage. If above checks are okay, but
		pressure switch is still not closed, replace gas valve.
	Ignition control	Check for supply voltage to ignition control at terminal
		#1 and neutral. If no voltage is present, trace wiring back
		to gas pressure switch. If voltage is present, check for
		supply voltage to burner blower motor at terminal #6 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 supply voltage switching to terminal NO as the
	pressure switch	air pressure switch closes. Check for air tube blockage
		or misalignment, adjust air pressure switch. If the above
		fails, replace air pressure switch.
	Spark generator	After a pre-purge time of 30 to 60 seconds after burner
		blower motor starts, check for supply voltage to spark
		generator. If voltage is not present, check burner reset
		switch. If voltage is still not present, replace ignition
		control. If voltage is present, visually check for spark at
		igniter.
	Igniter/sensor assembly	Check for visible damage to the igniter/sensor assembly.
		If there is no visible damage to the components, and no
		spark, replace the spark generator. If there is visible
		damage to the igniter/sensor assembly, replace. Also
		check for frayed or damaged wires in burner tube.
	Gas valve	Check for supply voltage to gas valve. If no voltage is
		present, check reset button. Check all connections for
		tightness. If there is still no voltage at the gas valve,
		replace ignition control. If there is voltage present, check
		for gas pressure at gas pressure tap located in gas
		piping. If there is no gas pressure, replace gas valve.
Flame will not stay on	Flame sensor	Check for flame sensor operation, connect a digital
		multimeter (capable of measuring DC microamps)
		between the flame sensor wire and terminal #1 on the
		ignition control. Sensor current is to be 3 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 DC 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 on, 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

Impinger I – Adv Digital – Gas Service Manual – International 7