Troubleshooting Guide; Electric Ovens - Lincoln 1400 Series Service Manual

SYMPTOM POSSIBLE CAUSE
Oven fan will not run Incoming Power Supply
Oven Fan Fuse
Fuse Holder
Fan Switch
1454-1455
Main Relay
Fan Motor
Capacitor
No control box Main Fan Relay
cooling
Axial Cooling Fan
No automatic control Incoming Power Supply
box cooling
Cooling Fan Thermostat
Oven will not heat Main Oven Fan
Centrifugal Switch (Main Fan)
Model 1452-1453
Air Pressure Switch
(1454-1455)
Hi Limit Thermostat (Oven
Cavity)
Control Box High Limit
Thermostat
18

TROUBLESHOOTING GUIDE

ELECTRIC OVENS

IMPINGER ADVANTAGE SERIES
EVALUATION
Check breakers/Reset if required. Call Power Co. if
needed.
Check and/or Replace
Check and/or Replace
Check continuity between switch terminals.
For these oven models, 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.
Check continuity to 120 VAC coil. Check for power to
the relay coil,(120 VAC). Check for 120/208/220/240
VAC to relay terminals. Visually check for contact pull-
in.
Check for opens, shorts, or ground. WITH POWER
OFF: Turn Fan Blade to check for locked rotor.
Check for opens, shorts, or grounds.
Check for power to main fan relay. Visually check for
contact pull-in.
WITH POWER OFF: turn fan blade to check for
locked rotor. Check for power to cooling fan. If voltage
is present at the fan motor and the fan does not run,
replace fan assembly.
Check circuit breakers, reset if required, call Power
Company if needed.
Thermostat is normally open and closes at 120°F ± 3
(48.9°C ± 7°), and opens at 100°F ± 3°F (37.8°C ±
1.7°C).
Check if main oven fan is operating. If not, refer to
"Oven fan will not run". Page 18.
Check for 120 VAC on both sides of switch. If voltage
is present on one side only and motor is running,
replace motor.
This normally open switch should close when the
main fan is activated. If adjustment is necessary
(Refer to page 28). Check tube for blockage. Replace
if defective.
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
thermostat.
Terminals are normally closed, but open at 130°F ±
5°F (53.9°C ± 2.8°C). Check for over heating and
reset thermostat. Test for proper operation. If it will not
reset and hold, then replace.
Impinger I – 1400 Series Advantage Service Manual - Dom & Int'l