Lincoln 1450, 1451 service manual Troubleshooting Guide, Symptom Possible Cause Evaluation

TROUBLESHOOTING GUIDE

IMPINGER ADVANTAGE GAS OVENS SERIAL NUMBER N28654 AND ABOVE (OVENS WITH PUSH BUTTON CONTROLS)

SYMPTOM	POSSIBLE CAUSE	EVALUATION
Oven fan will not run	Incoming power supply	Check circuit breaker, reset if required. Check power
		plug to be sure it is firmly in receptacle. Measure
		incoming power, call power co. if needed.
	Fuse, 10 Amp	Check, replace if necessary.
	Fuse holder	Check, replace if necessary.
	Switch, oven power	Check for 120VAC supply to switch. If no voltage is
		present, trace wiring back to fuse holder. Check
		continuity between switch terminals. Replace switch as
		needed.
	Motor, main fan	Check for 120VAC supply to the motor. If no voltage is
		present, trace wiring back to the switch. Check motor
		for opens, shorts or grounds.
		WITH POWER OFF: Turn fan blade to check for locked
		rotor.
No control box cooling	Incoming power supply	Check circuit breaker, reset if required. Check power
		plug to be sure it is firmly in receptacle. Measure
		incoming power, call power co. if needed.
	Fuse, 10 Amp	Check, replace if necessary.
	Fuse holder	Check, replace if necessary.
	Switch, oven power	Check for 120VAC supply to switch. If no voltage is
		present, trace wiring back to fuse holder. Check
		continuity between switch terminals. Replace switch as
		needed.
	Cooling fan	Check for 120VAC supply to the cooling fan. If no
		voltage is present, trace wiring back to the oven power
		switch. If voltage is present and motor does not run,
		check for opens, shorts or grounds.
		WITH POWER OFF: Check for locked rotor.
No automatic control	Incoming power supply	Check circuit breaker, reset if required. Check power
box cooling		plug to be sure it is firmly in receptacle. Measure
		incoming power. Call power co. if needed.
	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
		thermostat is open, replace cooling fan thermostat.
Control box cooling	Cooling fan thermostat	See “Cooling fan thermostat” (NOTE: Thermostat will
fan continues to run		remain closed if control box temperature remains
		above 120°F.
Oven will not heat	Main fan	If not operating, refer to “Oven fan will not run”.
	Gas supply	Check for adequate gas supply to oven.
	Centrifugal switch of main fan	Check for 120VAC at wire #5 (input to centrifugal
	motor	switch, located at 6-pin connector inside motor cover
		near main fan motor) to neutral. If no voltage is present,
		trace wiring back to oven power switch. If voltage is
		present, check for 120VAC at wire #9 (output of
		centrifugal switch) to neutral. If no voltage is present at
		wire #9, and the motor is running, replace the main fan
		motor.
	Burner blower motor	Check for 120VAC supplied to burner blower motor. If
		no voltage is present, trace wiring back to primary of
		control transformer. If voltage is present and motor is
4		Impinger I – 1450 Series Service Manual - Domestic