Lincoln Series 1000, Series 1200 service manual Troubleshooting / GAS Ovens 1033, 1034, 1046

TROUBLESHOOTING / GAS OVENS 1033, 1034, 1046, 1047

SYMPTOM	POSSIBLE CAUSE	EVALUATION
Oven fan will not run	Incoming Power Supply	Check breaker/reset if required. Call Power
		Company if needed. In these 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.
	Transformer Fuse	Check and/or replace.
	Fuseholder	Check and/or replace.
	Fan Switch	Check continuity between switch terminals.
	Oven Start Relay	Check for 120 VAC to the relay coil. If voltage is not
		present, trace wiring back to the fan switch. If
		voltage is present, check to insure contacts are
		closing.
	20 Minute Time Delay	Check for 120 VAC at terminal #1 to neutral on the
		20-minute timer. If no voltage is present, trace
		wiring back to the power supply. If voltage is
		present at terminal #1, check for 120 VAC at
		terminal #2 to neutral. If no voltage is present, and
		the oven start relay is closed, replace the 20-
		minute timer.
	Oven Fan Relay	Check for 120 VAC to coil of the oven fan relay. If
		no voltage is present, trace wiring back to terminal
		#2 of the 20-minute timer. Check for 120 VAC at
		terminals #2 and 6 of the relay, if no voltage is
		present, trace wiring back to the power supply. If
		voltage is present at the relay coil, check to insure
		the contacts are closing.
	Fan Fuse	Check, replace if necessary.
	Fuseholder	Check, replace if necessary.
	Capacitor	Check for opens, shorts, or grounds.
	Motor	Check for opens, shorts, or grounds. WITH
		POWER OFF: turn the fan blade to check for
		locked rotor.
No main fan cool down	20 Minute Time Delay	Check for 120 VAC at terminal #2 to neutral while
		oven is "on". Turn off the main fan switch, 120 VAC
		should continue to be present for 20 minutes. If
		voltage is not present for approx. 20 minutes,
		replace the timer.
	Oven Fan Relay	Check if relay is operating and that the contacts
		remain closed during the 20 minute cool down.
Main fan runs after 20	Oven Start Relay	Contacts should open when main fan switch is
minute cool down		turned off.
	20 Minute Time Delay	120 VAC at terminal #2 should discontinue
		approximately 20 minutes after main fan is
		switched off. If the oven start relay contacts are
		open, and the voltage continues at terminal #2 of
		the 20 minute timer, replace the timer.
	Oven Fan Relay	Check to insure that the contacts are opening after
		the coil is de-energized.
No control box cooling	Fan Switch Oven Start	(SEE MAIN FAN WILL NOT RUN) 120 VAC should
	Relay20 Minute Time Delay	now be at this motor. If voltage is present, check
	Oven Fan Relay Cooling	motor for shorts, opens, or grounds. WITH POWER
	Fans	OFF: check for locked rotor.

46 Impinger I -–1000 Series Service Manual - International