Impinger II – Advantage Digital Express Service Manual - International
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2 and Neutral. 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 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 terminal 2
and Neutral, 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.
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 ignition
control. If there is still no high voltage output, replace
the ignition control.
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 as the ignition control generates
the high voltage spark. Place manometer on the
pressure tap fitting (located in the gas piping just prior
to the burner manifold) and check for gas pressure. If
valve does not open, check reset button on ignition
control, and all connections for tightness. If there is still
no gas pressure, remove the ignition control from the
gas valve. Check the coils of the gas valve for opens or
shorts. Readings should be as follows, V1 – 2.9K ohms
approx., V2 – 1.3K ohms approx. If these readings are
not achieved, replace gas valve. If these readings are
achieved, replace ignition control.
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 the flame sensor
connection on the ignition control. Sensor current is to
be 0.9 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.
Power supply
Set the temperature to the lowest temperature setting.
If there is sufficient microamp current, but the flame will
not stay lit, check for proper polarity of the power
supply.
Ignition control
If there is sufficient microamp current, and there is
proper polarity of the power supply, but the burner will
not stay lit, check the reset button on the ignition
control. If the above test is okay, replace the ignition
control.
NOTE: Flame should be on at
this time
Low flame is on, but
no main flame
Control transformer
Check for supply voltage to the primary of control
transformer. If no voltage is present, trace wiring back
to oven fan switch. If voltage is present, check for
