Lincoln 1400 Series Troubleshooting Guide, GAS Ovens, Symptom Possible Cause Evaluation

TROUBLESHOOTING GUIDE

GAS OVENS

IMPINGER ADVANTAGE SERIES

SYMPTOM	POSSIBLE CAUSE	EVALUATION
Oven fan will not run	Incoming Power Supply	Check breakers, reset if required. Call Power Co. if
NOTE:		needed
	(Export Ovens)	For some export ovens, there is a control circuit step-
		down transformer. This transformer steps down
		supply voltage to 120 VAC. If main fan will not run,
		the secondary of this transformer must be checked
		for 120 VAC output. Check specific oven model
		schematic for circuit location.
	Oven Fan Fuse	Check and/or Replace
	Control Fuse	Check and/or Replace
	Fuse Holder	Check and/or Replace
	Fan Switch	Check continuity between switch terminals
	Main Relay	Check continuity to 120 VAC coil. Check for power to
		relay coil (120VAC). Check for supply voltage to
		relay contacts. Visually check for contact pull-in.
	Fan Motor	Check for opens, shorts, or ground. WITH POWER
		OFF: Turn Fan Blade to check for locked rotor.
	Capacitor	Check for opens, shorts, or grounds.
No control box	Main Fan Relay	Check for power to main fan relay. Visually check for
cooling		contact pull-in. Axial Cooling Fan. Check for power
		(120 VAC or 240 VAC, check specific model) to
		cooling fan. If voltage is present at the fan motor and
		the fan does not run, replace fan assembly.
No automatic control	Incoming Power Supply	Check breakers/Reset if needed. Check for incoming
box cooling		power at cooling fan thermostat.
	Cooling Fan Thermostat	Check cooling fan thermostat (thermostat closes at
		120°F and opens at 100°F). With cooling fan
		thermostat pre-heated, check for continuity. If switch
		is open, replace.
	Axial Cooling Fan	WITH POWER OFF: check for locked rotor. Check
		for proper voltage to the cooling fan, if present and
		fan does not run, replace the fan.
Control box cooling	Cooling Fan Thermostat	See "Cooling Fan Thermostat" (NOTE: Thermostat
fan continues to run		will remain closed if control box temperature
		exceeds 120°F)
Oven will not heat	Gas Supply	Check for adequate gas supply to oven
Model 1450-1451
	Manual Gas Shut-off Valve	Check to see that manual shut-off valve is open
	Main Oven Fan	Check if main oven fan is operating. If not, refer to
		"Oven fan will not run" on page 11.
For 1456, 1457,	Centrifugal Switch	Check for 120 VAC on both sides of (Main Fan)
1475, 1476 See		switch. If voltage present on one side only, and motor
Page 14.		is running, replace motor.
	Transformer, 24 VAC	Check for 120 VAC to primary of transformer. Check
		for 24 VAC from secondary of transformer. If there is
		primary voltage, but no secondary voltage, replace
		transformer.
	Burner Blower Motor	Check for 120 VAC supply to burner blower motor. If
		120 VAC is present and motor does not run, replace
		motor. WITH POWER OFF: turn blower wheel to
		check for locked rotor.

Impinger I – 1400 Series Advantage Service Manual – Dom & Int’l 11