Lincoln 1450 - Manual (Page 4)

Impinger I – 1450 Series Service Manual - Domestic 4
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
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.
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
fan continues to run
Cooling fan thermostat See “Cooling fan thermostat” (NOTE: Thermostat will
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
motor
Check for 120VAC at wire #5 (input to centrifugal
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