Lincoln Impinger Conveyor Ovens 1633-000-EA - Manual (Page 5)

Low Profile –1600 Series Advantage Digital Service Manual -–Int’l 5
TROUBLESHOOTING GUIDE
MODEL 1633-000 EA NATURAL GAS 230 VAC 50 HZ 1 PHASE
MODEL 1634-000-EA LP GAS 230 VAC 50 HZ 1 PHASE
NOTE: When checking components on left side of unit, be sure to check for proper connections in power
connector, (marked P. C. on schematic diagram) located inside motor cover.
SYMPTOM POSSIBLE CAUSE EVALUATION
Incoming power supply Check breakers/ reset if required call Power company
if needed
Oven fan switch Check continuity between switch terminals.
Hi-limit thermostat(s), control
box Terminals are normally closed, if open, reset
thermostat and test oven for proper operation. If it will
not reset, replace thermostat.
Fan fuse Check, replace if necessary.
Fuseholder Check, replace if necessary.
Oven fan relay Check for power to coil of oven fan relay. If no voltage
is present, trace wiring back to hi-limit thermostat.
Check for supply voltage at terminal #6 of the relay. If
no voltage is present, trace wiring back to fuse holder.
If voltage is present, at the relay coil, check to insure
the contacts are closing.
Capacitor(s) Check for opens, shorts, or grounds.
Oven fan will not
run
Motor(s), main fan Check for opens, shorts, or grounds.
Fan switch (SEE OVEN FAN WILL NOT RUN.)
Hi-limit thermostat(s)
Oven fan relay
No control box
cooling
Cooling fan(s) Supply voltage should now be at these motors. If
voltage is present, check motor for open, shorts, or
grounds. WITH POWER OFF: check for locked rotor.
Incoming power supply Check circuit breakers, reset if needed. Call power
company if needed.
Cooling fan thermostat(s) Check the cooling fan thermostat.(thermostat closes
at 120
°F and opens at 100°F). With the cooling fan
thermostat preheated, check for continuity. If switch is
open, replace.
No automatic
control box cooling
Cooling fan(s) Supply voltage should now be at these motors. If
voltage is present, check motor for opens, shorts or
grounds. WITH POWER OFF: Check for locked rotor.
Gas supply Check for adequate gas supply to oven.
Manual gas shut off valve Check to see that the manual gas shut off valve is
open. Also check flexible gas line connection for any
damage.
Fan switch Check to see that the fan switch is on.
Oven will not heat
Main oven fan Check if main oven fan is operating. If not, refer to
“Oven fan will not run”.
NOTE: These ovens utilize 2 complete Burner/Temperature control systems. Each system will Follow the same
troubleshooting sequence.
Oven power relay Check for line voltage to the relay coil. If no voltage is
present, trace wiring back to the control box hi-limit
thermostat(s). If voltage is present, check to insure
contacts are closing. Replace relay as needed.
Fuse, burner 3A. Check, replace if necessary. Serial Number
L31478 & Below
Fuseholder Check, replace if necessary.