Lincoln Impinger 1450, Service Manual

Page: 11 / 44

Impinger I – 1400 Series Advantage Service Manual – Dom & Int’l 11
TROUBLESHOOTING GUIDE
GAS OVENS
IMPINGER ADVANTAGE SERIES
SYMPTOM POSSIBLE CAUSE EVALUATION
Incoming Power Supply Check breakers, reset if required. Call Power Co. if
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 Check and/or Replace
Control Fuse 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
relay coil (120VAC). Check for supply voltage to
relay contacts. Visually check for contact pull-in.
Fan Motor Check for opens, shorts, or ground. WITH POWER
OFF: Turn Fan Blade to check for locked rotor.
Oven fan will not run
NOTE:
Capacitor Check for opens, shorts, or grounds.
No control box
cooling Main Fan Relay Check for power to main fan relay. Visually check for
contact pull-in. Axial Cooling Fan. Check for power
(120 VAC or 240 VAC, check specific model) to
cooling fan. If voltage is present at the fan motor and
the fan does not run, replace fan assembly.
Incoming Power Supply Check breakers/Reset if needed. Check for incoming
power at cooling fan thermostat.
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 switch
is open, replace.
No automatic control
box cooling
Axial Cooling Fan WITH POWER OFF: check for locked rotor. Check
for proper voltage to the cooling fan, if present and
fan does not run, replace the fan.
Control box cooling
fan continues to run Cooling Fan Thermostat See "Cooling Fan Thermostat" (NOTE: Thermostat
will remain closed if control box temperature
exceeds 120°F)
Oven will not heat
Model 1450-1451 Gas Supply Check for adequate gas supply to oven
Manual Gas Shut-off Valve Check to see that manual shut-off valve is open
Main Oven Fan Check if main oven fan is operating. If not, refer to
"Oven fan will not run" on page 11.
Centrifugal Switch Check for 120 VAC on both sides of (Main Fan)
switch. If voltage present on one side only, and motor
is running, replace motor.
Transformer, 24 VAC Check for 120 VAC to primary of transformer. Check
for 24 VAC from secondary of transformer. If there is
primary voltage, but no secondary voltage, replace
transformer.
For 1456, 1457,
1475, 1476 See
Page 14.
Burner Blower Motor Check for 120 VAC supply to burner blower motor. If
120 VAC is present and motor does not run, replace
motor. WITH POWER OFF: turn blower wheel to
check for locked rotor.