Frymaster M3000 manual Troubleshooting the AIF System AIF, LOV Generation II Technical Reference

LOV™ Generation II Technical Reference

Troubleshooting the AIF System (AIF)

Problem	Probable Cause	Fix
		1. Ensure the actuator is plugged into the correct
	1. Actuator is plugged into wrong	connection (J1 for FV return, J3 for DV return;
Wrong vat		J6 for FV drain, J7 for DV drain).
	connector.
opens.		2. Ensure the locator pin is in the proper position
	2. Locator pin is in wrong position.
		in plug J2. (See charts on pages 43-47 of this
		manual for proper pin position.)
		1. Check pins 5 and 6 of J2 at the MIB board.
		Should read 24VDC. Check voltage on pins
		5 and 6 at the other end of the harness and
		ensure 24VDC is present. Check pins 5 and 6
		for 24VDC on plugs J4 and J5 on AIF boards.
		2. Ensure actuator leads are plugged into AIF
		board (J1 for FV return, J3 for DV return; J6
		for FV drain, J7 for DV drain).
		3. Check the power on the connector of the
		problem actuator while manually opening
	1. No power to AIF board.	or closing the actuator. Pins 1 (black) and 4
	2. Actuator unplugged.	(white) should produce +24VDC when the
Actuator doesn’t	3. AIF board failure.	actuator is opening; -24VDC should be read
function.	4. Actuator readings are out of	from Pins 2 (red) and 4 (white) when the
	tolerance.	actuator is closing. If either voltage is missing,
	5. Actuator is bad.	the AIF board is likely bad. Test the actuator
		by plugging into another connector to open
		or close. If the actuator operates, replace the
		board.
		4. Check resistance of the potentiometer
		between pin 2 (purple wire) and pin 4 (gray/
		white wire). Closed should read 0-560Ω. Open
		should read 3.8KΩ - 6.6KΩ.
		5. If proper voltages are seen at the connector
		and the actuator doesn’t operate, replace the
		actuator.

Oil Return Sensor Troubleshooting (Gas LOV™ Fryers)

The oil return sensor is a device that is used to prevent dry firing of the burners. The sensor looks similar to a high limit. The sensors are energized when the computer is powered on with a soft on. The sensor heats up and detects the oil around it. During filtration when the oil is drained, it senses the difference between the oil and air. It is controlled with a board located next to the interface board (right) and a separate egg shaped plastic device (far right) that contains additional electronics. Use care when working with the sensor as temperatures may reach as high as 500°F (260°C).

The oil return sensor is controlled by a small green board and the electronics inside the plastic, egg-shaped device shown above to prevent dry firing.

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