Middleby Marshall PS500 installation manual IV. Quick Reference Troubleshooting, Symptom Problem

SECTION3-OPERATION

IV. QUICK REFERENCE: TROUBLESHOOTING

ENGLISH

			SYMPTOM			PROBLEM
					The oven temperature ex-
					ceeded 650°F (343°C), and
light is lit, food product is					the burner or heating ele-
					ments were automatically
			undercooked
					shut down.
			Oven will not		Electrical power may not be
				turn on at all	reaching the oven, or the
					controls may be set incor-
					rectly.
Oven shuts down shortly					The gas burner did not light
	after it is turned on				within 90 seconds of turn-
		(gas ovens only)			ing the "HEAT" (			) Switch
					to the “ON” ("I") position.
					This automatically en-
					gages a safety		lockout
					mode.

SOLUTION

•Follow the procedures under Daily Shutdown Procedures in this section to shut down the oven. Contact your Middleby Marshall Authorized Service Agent to determine and correct the cause of the condition to prevent damage to the oven.

•Check that the circuit breaker/fused disconnect is turned on.

•Check that the "BLOWER" () Switch is in the “ON” ("I") position. The burner cannot engage until the blowers are in operation.

•Turn the "HEAT" (), "BLOWER" (), and "CONVEYOR" ()switches to the "OFF" ("O") position.

•Wait for AT LEAST FIVE MINUTES before restarting the oven.

•Repeat the Daily Startup procedure.

The oven did not reach 200°F (93°C) within 15 min- utes of startup, and the oven has stopped heating.

appears in display, oven is not heating

Oven will not heat	Controls may be set incor-
	rectly.

	Oven is operating, but			Air fingers may have been
little or no air is blowing				reassembled incorrectly
		from air fingers		after cleaning.
Conveyor moves with a				Conveyor may be jammed
jerky motion, or will not				on an object in the oven, or
			move at all	conveyor belt or drive chain
				tension may be incorrect.

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Turn the "HEAT" (), "BLOWER" (), and "CONVEYOR" ()switches to the "OFF" ("O") position.

Wait for AT LEAST FIVE MINUTES before restarting the oven. Repeat the Daily Startup procedure.

Check that the Set Point is correctly set.

Check that both the "BLOWER" () and "HEAT" () Switches are in the “ON” ("I") position.

If the oven still will not heat,turn the "HEAT" (), "BLOWER" (), and "CONVEYOR" ()switches to the "OFF" ("O") position.

Wait for AT LEAST FIVE MINUTES before restarting the oven.

Repeat the Daily Startup procedure. Check that the Set Point is above 200°F (93°C).

Turn the oven off, and allow it to cool. Disconnect electrical power to the oven.

Refer to Section 4, Maintenance, for instructions on reassem- bling the air fingers.

Turn the oven off, and allow it to cool. Disconnect electrical power to the oven.

Check if the conveyor is blocked by an object inside the oven.

Refer to Section 4, Maintenance, for instructions on checking the conveyor and drive chain tension.

Food products are	Controls may be set incor-	• Check that the set temperature and bake time settings are
overcooked or	rectly.	correct.
undercooked.

IF THESE STEPS FAIL TO RESOLVE THE PROBLEM, CONTACT YOUR LOCAL MIDDLEBY MARSHALL AUTHORIZED SERVICE AGENT. A SERVICE AGENCY DIRECTORY IS SUPPLIED WITH YOUR OVEN.

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