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Impinger I – Adv Digital – Gas Service Manual – International
8
not stay on, check the reset button for the ignition
control. If the above check okay, replace ignition control.
Oven will not heat
S/N N31349 and
Above
Main fan If not operating, refer to “Oven fan will not run”
Gas supply Check for adequate gas supply and be sure that the
manual gas shut off valve is open. Also check flexible
gas line connection..
Air pressure switch Check air switch terminals for supply voltage to
terminals COM and NO. If voltage is present on one side
only, check for air tube blockage or misalignment. If
these are okay, adjust air pressure switch or replace
switch as needed.
Oven cavity hi-limit
thermostat
Terminals are normally closed, opens at 350°C (660°F).
If open, reset and test oven for proper operation. If
thermostat will not hold for maximum temperature, and
oven is not exceeding control setting, check for proper
location of the capillary bulb in its spring holder. If above
checks are okay, replace hi-limit thermostat.
Ignition control Check for supply voltage to ignition 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 30 seconds, reset
ignition control, and re- try. If the above fails, replace
ignition control.
Burner reset switch Switch is normally open. Check to see that the switch
closes when reset button is pushed. Replace as needed.
Burner blower motor Check for supply voltage to burner blower motor. If no
voltage is present, trace wiring back to the ignition
control.
WITH POWER OFF: Turn blower wheel to check for
locked rotor.
If supply voltage is present and motor does not run,
replace burner blower motor.
Burner blower motor air
pressure switch
Check for air pressure switch to be switching from “NC”
to “NO”. Check for air tube blockage or misalignment.
Adjust air pressure switch. If the above fails, replace air
pressure switch.
Ignition control A pre-purge time of 30 to 60 seconds occurs after
burner blower motor starts. Check for high voltage spark
output from the ignition control. If there is no high
voltage spark output, check reset button for the ignition
control. If there is still no high voltage output, replace the
ignition control.
Igniter/sensor assembly
Check for visible damage to the igniter/sensor assembly.
If there is visible damage to the igniter/sensor assembly,
replace. If there is no visible damage to the components,
and no spark, replace the igniter/sensor assy. Also
check for frayed or damaged wires in burner tube.
Replace components as needed.
Ignition control Gas valve should open as the ignition 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 ignition control. If there is still
no voltage to the pilot valve, replace ignition control.
Gas valve Check for supply voltage to pilot valve terminal #5 to
neutral, if there is no voltage, trace wiring back to
ignition control. If there is supply voltage, connect a
manometer to the pressure tap fitting on the gas valve. If