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Impinger II – Advantage Digital Service Manual - International
9
blockage or damage. If above checks are okay, but
pressure switch is still not closed, replace gas valve.
Air pressure switch Check air switch terminals for supply voltage to
terminals NO2 and COM. 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
if necessary.
Oven cavity hi-limit thermostat
Terminals are normally closed, opens at 660°F (350°C).
If open, reset and test oven for proper operation. If
thermostat will not hold for maximum oven temperature,
and oven is not exceeding control setting, check for
proper location of capillary bulb in its spring holder. If
above checks are okay, replace hi-limit thermostat.
Ignition control Check for proper supply voltage to ignition control.
Check for proper voltage to the burner blower motor.
This can be checked at motor connecting plug
terminals 2 and 5. If voltage is present, proceed with
next step, if not, wait 30 seconds, push reset button
and try to restart. If this fails, check wires from
thermostat and burner blower motor to the ignition
control. If the above checks okay, replace ignition
control.
Burner blower motor Check for supply voltage to motor. WITH POWER OFF:
Turn blower wheel to check for locked rotor. If supply
voltage is present at motor connecting plug terminals 2
and 5, and motor does not run, replace burner blower
motor.
Air pressure switch
(burner blower)
Check for proper supply voltage switching from “NC” to
“NO” on ignition control. Check for air pressure switch
adjustment, air tube blockage or misalignment. If these
adjustments fail, replace air pressure switch.
Spark generator A pre-purge time of 30 to 60 seconds occurs after
burner blower motor starts. Check for supply voltage at
spark generator. If voltage is not present, check reset
button for ignition control. If voltage is still not present,
replace ignition control. If there is input voltage to the
spark generator, but there is no high voltage output,
replace the spark generator.
Igniter/sensor assembly Check this assembly for visible damage. Replace as
needed. If there is no visible damage, check for voltage
supply to igniter/sensor assembly. If there is voltage
supplied to the igniter/sensor, but there is no spark,
replace igniter/sensor assembly.
Gas valve Gas valve should open when proper supply voltage is
present. If there is no voltage present, check reset
button on ignition control, and all connections for
tightness. If there is still no voltage to gas valve,
replace the ignition control. If there is voltage to the gas
valve, check for gas pressure at the gas pressure tap
(located in the gas piping just prior to the burner). If
there is no gas pressure, replace the gas valve.
Flame will not stay on Flame sensor To check for flame sensor operation, connect a digital
multimeter (capable of measuring DC microamps)
between the flame sensor wire and terminal #1 on the
ignition control. Sensor current is to be 3 microamps,
minimum. If these readings are not achieved, replace
igniter/sensor assembly. Also check for any type of
damage to flame sensor wire and connections.
NOTE: The DC microamp test must be conducted with
the oven in low flame (bypass) operation.