Lincoln Impinger X2 Ovens with Push Button Controls 3270-2 - Manual (Page 12)

Impinger X2 – Digital Service Manual – Dom & Int’l 12
damage.
Main fan motor Check for main fan operation. If it is not operating, refer
to “Oven fan will not run”.
Relay, main fan Check for supply voltage to relay terminal #13. If
voltage is not present, trace wiring back to power
supply. If voltage is present, check for supply voltage at
terminal #14. If there is no voltage at terminal #14, and
the relay is energized, replace the main fan relay.
Air pressure switch, Main fan
motor Check for supply voltage to the air pressure switch. If
no voltage is present, trace wiring back to main fan
switch. This normally open switch should close when
the main fan is activated. Check air switch tube for
blockage or any obstructions, repair as needed. Refer
to the “Removal and installation” section for proper
adjustment of air pressure switch. Replace air pressure
switch as needed.
Hi-limit thermostat, oven cavity Terminals are normally closed. If open, reset
thermostat and retest. If thermostat will not hold for
maximum oven temperature, and oven is not exceeding
temperature setting, check for proper location of
capillary bulb in its spring holder. If the capillary checks
okay, replace the hi-limit thermostat.
Burner control Check for supply voltage to burner control at terminal
#1 and Neutral. If no voltage is present, trace wiring
back to hi-limit thermostat. If voltage is present, check
for supply voltage to burner blower motor at terminal #8
and neutral. If no voltage is present, wait thirty
seconds, reset burner control, and re-try. If the above
fails, replace burner control.
Burner reset switch. Switch is normally open, check to see that the switch
closes when reset button is pushed. Replace switch as
needed.
Motor, burner blower Check for supply voltage to the burner blower motor. If
no voltage is present, trace wiring back to the burner
control. If voltage is present, and the motor is not
turning, check for opens, shorts or grounds.
WITH POWER OFF: Check for locked rotor.
Replace burner blower motor as needed.
Air pressure switch, burner
blower motor Check for air pressure switch to be switching from “NC”
to “NO”. Check for air tube blockage or misalignment.
Replace air pressure switch as needed.
Burner control A pre-purge time of 30 – 60 seconds occurs after
burner blower motor starts. Check for high voltage
spark output from the burner control. If there is no high
voltage spark output, check reset button for the burner
control. If there is still no high voltage output, replace
the burner control.
Igniter/sensor assembly Check for visible damage to the igniter/sensor
assembly. If there is visible damage, replace
components as needed. If there is no visible damage to
the components, and there is no spark, replace the
igniter/sensor assembly. Also check for damaged wires
in the burner tube. Replace components as needed.
Burner control Gas valve should open as the burner control generates
the high voltage spark. Check for supply voltage to pilot
valve at terminal #5 and neutral. If no voltage is
present, check reset button for the burner control. If
there is still no voltage the pilot valve, replace burner
control
Gas valve Check for supply voltage at the pilot valve. If no voltage
is present, trace wiring back to the burner control. If