Lincoln 3240-2 supply voltage to terminal #20 on the electronic, pressure, replace the valve

	On at this time	control at terminals #13 and #12. Of there is no voltage,
	Electronic temperature	trace wiring back to the burner switch. Also check for
	control	supply voltage to terminal #20 on the electronic
		temperature control. If there is no voltage at terminal
		#20, trace wiring back to terminal #13. Set temperature
		control to maximum temperature and check for output
		voltage at terminal #21 and neutral. If voltage is present
		at terminal #20 and neutral, and the unit is not heating,
		refer to “Temperature regulation valve” for next check.
		If voltage is not present, proceed.
	Thermocouple probe	WITH POWER ON AND THERMOCOUPLE LEADS
		ATTACHED TO THE ELECTRONIC TEMPERATURE
		CONTROL: Measure the D.C. millivolt output of these
		leads. Refer to chart in the “Removal, Installation and
		Adjustment” section for proper readings. If these
		readings are not achieved, replace thermocouple.
	Burner control.	Check for supply voltage to main valve. If no voltage is
		present, trace wiring back to burner control. If there is
		no voltage output, replace burner control.
	Main gas valve	Check for supply voltage to main valve. If there is
		voltage present, check to see that valve is opening.
		Connect manometer to pressure tap on outlet side of
		valve. If there is voltage to the valve, but no output gas
		pressure, replace the valve.
	Temperature regulation valve	If supply voltage is present on the electronic
		temperature control, terminal #13 to neutral, check for
		voltage at temperature regulation valve. If no voltage is
		present, trace wiring back to electronic temperature
		control, terminal #20. 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 over-
		heat and then cool, this will cause the units to cycle on
		and off intermittently. Improper ventilation or lack of
		preventive maintenance may cause this. Also, most of
		the problems listed under “Oven will not heat” can
		cause intermittent failure.
Conveyor will not run	NOTE: The ovens may contain	two, three or four conveyor drive systems using like
	components. The trouble shooting sequence will be the same for each of the conveyor
	drive systems
	Power supply	Check circuit breakers, reset if required. Check power
		plug to be sure it is firmly in receptacle. Measure
		incoming power, call power co. if needed.
	Switch, oven fan	Check continuity between switch terminals. Replace
		switch as needed.
	Relay, main fan	Check for supply voltage to relay terminal #13. If
		voltage is not present, trace wiring back to power
		supply. If voltage is present, check for supply voltage at
		terminal #14. If there is no voltage at terminal #14, and
		the relay is energized, replace the main fan relay.
	Fuse, 2 Amp	Check, replace if necessary.
	Fuse holder	Check for supply voltage to fuse holder. If no voltage is
		present, trace wiring back to main fan relay. Check fuse
		holder, replace if necessary.
	Switch, conveyor	Check for supply voltage to conveyor switch. If no
		voltage is present, trace wiring back to fuse holder.
		Check continuity between switch terminals. Replace
14		Impinger X2 – Analog Service Manual – Dom & Int’l