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Impinger II – Advantage Digital Service Manual - Domestic
9
valves, the valve should open. Check for gas
pressure at the manifold tap located just before
the burner. If there is no pressure, check the
incoming gas supply to be sure all manual valves
are open and flexible gas hose is properly
connected. If gas is present, and the gas control
valve is energized, but there is no gas pressure at
the burner manifold, replace the gas control
valves.
Flame will not stay lit Hot surface igniter Six seconds after the gas valve opens, ignition
must occur. If flame is not detected, the ignition
control will shut off and lock out. To reset the
ignition control, turn off the power switch for 45
seconds, then turn the switch on to re-try ignition.
The ignition control requires a minimum of 0.8 DC
microamps to prove flame. To check flame
sensing operation, connect a digital multimeter
(capable of measuring DC microamps) between
the “ground” terminal on ignition control and the
ground lead.
NOTE: This is a current measurement and the
meter must be connected in series
If these readings are not achieved, replace hot
surface igniter.
NOTE: The DC microamp test must be conducted
with the oven in low flame (bypass) operation. Set
the temperature control to the lowest setting.
Power supply If there is sufficient microamp current, but the
flame will not stay lit, check for proper polarity of
the 120VAC power supply.
Ignition control If there is sufficient microamp current, and the
120VAC polarity is correct, but the flame will not
stay lit, replace the ignition control.
NOTE: Check for proper ground connection on
ignition control.
NOTE: Flame should be on at
this time
Low flame is on,
but no main flame
Control transformer Check for 120VAC supply to the primary of the
control transformer. If no voltage is present, trace
wiring back to the main power switch. If voltage is
present, check for 24VAC at the transformer
secondary. If there is primary voltage, but no
secondary voltage, replace the control
transformer.
Oven control Check for 24VAC supply to control. If no voltage is
present, trace wiring back to control transformer. If
24VAC is present, check for a read-out on the
display. If there is 24VAC supplied, but there is no
read-out on the control display, replace the oven
control.
If there is a read-out on the control, set the control
to maximum temperature (see installation
operations manual for temperature adjustment).
With the control set at maximum temperature,
check for 120VAC at the temperature regulation
valve. If there is voltage at the temperature
regulation valve, proceed to “Temperature
regulation valve” for next check. If there is no
voltage at the temperature regulation valve, trace
wiring back to the oven control. If there is no