Lincoln 1000, 1400, 1200 service manual Troubleshooting Guide, Symptom, Possible Cause, Evaluation

TROUBLESHOOTING GUIDE 1000 & 1200

	GAS OVENS
SYMPTOM	POSSIBLE CAUSE	EVALUATION
Oven fan will not run	Incoming Power Supply	Check breakers/ Reset if required / Call Power Co.
NOTE:		if 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(s)	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 (120 VAC). Check for 208/240 VAC to
		relay terminals. Visually check for contact pull-in.
	Fan Motor	Check for opens, shorts, or grounds. WITH
		POWER OFF: Turn Fan Blade to check for locked
		rotor.
	Capacitor	Check for opens, shorts, or grounds.
No Main Fan Cool	Cool Down Thermostat	Check cool down thermostat (thermostat closes at
Down		160°F and opens at 140°F). Check for power (120
		VAC) at cool down thermostat. With the cool down
		thermostat pre-heated, check for continuity. If
		switch is open, replace.
No Control Box	Main Fan Relay	Check for power to Main Fan Relay. Visually check
Cooling(For ovens		for contact pull in.
equipped with Control
Box Cooling Fan)	(Export Ovens)	(For ovens equipped with a control circuit step-
	Axial Cooling Fan	down transformer, the supply voltage for the
NOTE:		cooling fan is 240 VAC.)
		WITH POWER OFF: check for locked rotor. Check
		for power (120 VAC) to cooling fan. If 120 VAC 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
box cooling (For ovens		incoming power (120 VAC)at cooling fan
equipped with control		thermostat.
box cooling fan)	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	Check for 120 VAC to cooling fan, if present and
		fan does not run, replace fan.
Control box cooling fan	Cooling Fan Thermostat	See "Cooling Fan Thermostat"
continues to run
Oven will not heat	Gas Supply	Check for adequate gas supply to oven.
	Manual Gas Shut-off Valve	Check to see that manual shut-off valve is open.
	Fan Switch	Check to see that fan switch is "on".
	Main Oven Fan	Check if main oven fan is operating. If not, refer to
		"Oven fan will not run". Page 20.
	Burner Switch	Check for 120 VAC to neutral on both sides of
		switch. If switch is closed and 120 VAC is present
		on one side only, replace the switch.
20		Impinger I -–1000 Series Service Manual - Domestic