Lincoln Impringer Conveyor Oven 1200 - Manual (Page 26)

Impinger I -–1000 Series Service Manual - International 26
TROUBLESHOOTING GUIDE 1000 & 1200 / GAS OVENS
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(s) 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 (120 VAC). Check for 208/240 VAC to
relay terminals. Visually check for contact pull-in.
Fan Motor Check for opens, shorts, or grounds. 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 Main Fan Cool
Down Cool Down Thermostat Check cool down thermostat (thermostat closes at
160°F and opens at 140°F). Check for power (120
VAC) at cool down thermostat. With the cool down
thermostat pre-heated, check for continuity. If
switch is open, replace.
No Control Box
Cooling(For ovens
equipped with Control
Box Cooling Fan)
NOTE: Main Fan Relay
(Export Ovens)
Axial Cooling Fan Check for power to Main Fan Relay. Visually check
for contact pull in.
(For ovens equipped with a control circuit step-
down transformer, the supply voltage for the
cooling fan is 240 VAC.)
WITH POWER OFF: check for locked rotor. Check
for power (120 VAC) to cooling fan. If 120 VAC 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 (120 VAC)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 (For ovens
equipped with control
box cooling fan)
Axial Cooling Fan Check for 120 VAC to cooling fan, if present and
fan does not run, replace fan.
Control box cooling fan
continues to run Cooling Fan Thermostat See "Cooling Fan Thermostat"
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. Check for adequate gas supply to oven.
Manual Gas Shut-off Valve Check to see that manual shut-off valve is open.
Fan Switch Check to see that fan switch is "on".
Transformer, 24 VAC
Main Oven Fan Check if main oven fan is operating. If not, refer to
"Oven fan will not run". Page 26.