Middleby Marshall KIT P/N 36939 manual Rplc, Diagnostic Error Messages

Diagnostic Error Messages

The controller runs background tests during normal operation. If a problem with the background tests occurs, an error message is shown (flashing) in the Display. These are called Diagnostic Error Messages (Table 3).

Table 3 - Diagnostic Error Messages

	Display	Corrective Action
	rPLC	1. Turn Blower Switch OFF for 2
	Flashes on the display	minutes, then Turn Blower Switch
		ON.
	alternately with
	temperature indicating	2. Replace the controller if the
	that the controller’s
		problem does not clear after repeating
	internal diagnostics test
		action 1 above three times.
	has failed.
	rSET	1. Turn Blower Switch OFF for 2
	Oven temperature has
		minutes, then Turn Blower Switch
	not reached at least	ON.
	200˚F(93˚C) within 15	2. If problem does not clear, call
	minutes of operation;
	usually a result of the	the Middleby Cooking Systems
	burner not lighting.	Group (MCSG) for assistance.
		1. Check that the thermocouple is
		connected to terminals 7 & 8 of the
		temperature controller.
	OPEn	2. If connections are good, then check
		the continuity of the thermocouple at
	Caused by an	room temperature. The resistance
	open circuit in the	reading should be in the 9 - 20 Ohm
	thermocouple circuit.	range. Remove & replace an open
		thermocouple.
		3. If the thermocouple checks good,
		call MCSG for assistance.
	r TC	1. Check the polarity of the
		thermocouple leads; terminal 7 (-)
Reverse polarity of the		RED wire & terminal 8 (+) WHITE
thermocouple leads.		wire.
		2. If polarity connections are
		correct replace thermocouple.

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©1997 Middleby Marshall Inc.	Part # 36622
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