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

TROUBLESHOOTING GUIDE

	ELECTRIC OVENS MODEL SERIES 1000 & 1200
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(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 the relay coil (120 VAC). Check for 208/220/240
		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 cool down
		thermostat pre-heated, check for continuity. If
		switch is open, replace.
No control box cooling	Main Fan Relay	Check for power to main fan relay. Visually check
		for contact pull in.
	Axial Cooling Fan	WITH POWER OFF: turn the fan blade to 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.
Oven will not heat	Main Oven Fan	Check if main oven fan is operating. If not, refer to
		"Oven fan will not run."
	Heat Switch	Check for continuity between switch terminals with
		switch on. Replace if defective.
	Air Pressure Switch	Check for 120 VAC on both sides of switch. If
		voltage present on one side only, check for air tube
		blockage, adjust air switch. If above fails, replace
		air pressure switch.
	Hi Limit Thermostat	Terminals are normally closed. 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, replace
NOTE:		thermostat (rated at 190°F).
	Hi Limit Thermostat	Terminals are normally closed. If open, reset and
	(Model 1032)	test oven for proper operation. If thermostat will not
		hold for maximum oven temperature, and oven is
		not exceeding temperature dial setting. Replace
		the thermostat. Check for proper location of
		sensing bulb in its spring holder. If hi-limit is still
		tripping, replace (rated for 368°C).
	3 Amp Temperature Control	Check and/or Replace
	Fuse
	Fuseholder	Check and/or replace.

Impinger I -–1000 Series Service Manual - Domestic 25