With Power on and Thermocouple

	Oven control	If the thermocouple checks good, but the oven
		control display indicates that there is a thermocouple
		failure, replace the oven control. If the oven control
		indicates a temperature reading but the oven won’t
		heat, proceed.
	Thermocouple	WITH POWER ON AND THERMOCOUPLE
		ATTACHED TO THE OVEN CONTROL: Measure
		the DC millivolt output of the thermocouple. Refer to
		the thermocouple chart (located in the “Removal”
		section of the manual) for proper millivolt readings. If
		these readings are not achieved, replace
		thermocouple.
	Oven control	If the thermocouple checks good, but there is no
		120VAC output to the temperature regulation valve,
		replace the oven control. If there is 120VAC output to
		the temperature regulation valve, proceed.
	Temperature regulation valve	Check for 120VAC supplied to temperature
		regulation valve. If voltage is present, listen for valve
		to open and close. Also check for opens or shorts in
		the operating coil. Replace temperature regulation
		valve as needed.
Intermittent heating	Thermal/overload of main fan	The main fan motor and burner blower motor are
	and burner blower motors	equipped with internal thermal protection and will
		cease to operate if overheating occurs. As the
		motors overheat and then cool, this will cause the
		heating system to cycle on and off intermittently.
		Improper ventilation or lack of preventive
		maintenance may cause this problem. Also, most of
		the problems listed under “Oven will not heat” can
		cause intermittent failure.
Conveyor will not run	Power supply	Check for incoming voltage at line 1 to neutral. There
		should be a reading of 120VAC. If not present, check
		circuit breakers.
	Fuse, 10 Amp	Check, replace if necessary.
	Fuse holder	Check, replace if necessary.
	Hi-limit thermostat, control box	Check for voltage on both sides of switch. Terminals
		are normally closed. If open, reset and test oven for
		proper operation. If thermostat will not hold, and
		control box temperature is not exceeding 140°F
		(60°C), replace thermostat.
	Power switch	Check continuity between switch terminals. Replace
		switch as needed.
	Control transformer	Check for 120 VAC supply to the primary of the
		control transformer. If no voltage is present, trace
		wiring back to the oven power relay. If voltage is
		present, check for 24 VAC at the transformer
		secondary. If there is primary voltage but no
		secondary voltage, replace control transformer.
	Conveyor motor	Check for 120 VAC supply to the conveyor motor at
		wire #14 to neutral. If no voltage is present, trace
		wiring back to the primary of the control transformer.
		If voltage is present and the motor will not run, check
		the motor windings for opens or shorts.
		WITH POWER OFF: Check the motor windings as
		follows:
		Grey to black - 38Ω approx.
		Grey to blue - 38Ω approx.
		Blue to black - 75Ω approx.
		If any of the above fails, replace conveyor motor.
	Capacitor, conveyor motor	Check for shorts or grounds. Replace capacitor as

14	Impinger II – Advantage Digital Express Service Manual - Domestic