Middleby Marshall Model PS536 Iv. Quick Reference Troubleshooting, Symptom, Problem, Solution

SECTION3-OPERATION

IV. QUICK REFERENCE: TROUBLESHOOTING

SYMPTOM

	light illu-
	minates	after
ENGLISH	oven has	been
	completely	dur-
	operating	nor-
	mally
	Oven shuts down
	ing operation

PROBLEM

The oven temperature is in excess of 600°F (316°C). If the oven is left in operation, the temperature may rise to 650°F (343°C) and cause a shutdown.

The oven temperature ex- ceeded 650°F (343°C), and the oven was automatically shut down.

SOLUTION

•Turn the oven off according to the Daily Shutdown Procedure.

•Allow the oven to cool. Regardless of the time that is required for the oven to cool, wait for AT LEAST FIVE MINUTES before restarting the oven.

•Repeat the Daily Startup Procedure.

•Turn the oven off according to the Daily Shutdown Procedure. Contact your Middleby Marshall Authorized Service Agent to determine and correct the cause of the condition to prevent damage to the oven.

light is lit, oven will not heat

Oven shuts down shortly after it is turned on

(gas ovens only)

The gas burner did not light within 90 seconds of turn- ing the "BLOWER" () Switch to the “ON” ("I") posi- tion. This engages a safety lockout mode.

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

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

•Repeat the Daily Startup procedure.

appears in dis- play, oven is not heating

Oven will not turn on at all

Oven will not heat

Oven is operating, but little or no air is blowing from air fingers

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

Electrical power may not be reaching the oven, or the controls may be set incor- rectly.

Controls may be set incor- rectly.

Air fingers may have been reassembled incorrectly after cleaning.

Blower belt may be broken.

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Turn the "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 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.

Check that the Set Point is correctly set.

Check that the "BLOWER" () Switch is in the “ON” ("I") position.

If the oven still will not heat, turn the oven off according to the instructions in the Daily Shutdown Procedure.

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 according to the Daily Shutdown Procedure.

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

Turn the oven off according to the Daily Shutdown Procedure. Contact your Middleby Marshall Authorized Service Agent to correct the problem.

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
					may be overtightened.
	Food products are				Controls may be set incor-
		overcooked or			rectly.
			undercooked

•Turn the oven off according to the Daily Shutdown Procedure.

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

•Check that the conveyor drive chain is not overtightened.

•Refer to Section 4, Maintenance, for instructions on checking the conveyor belt tension.

•Check that the set temperature and bake time settings are correct.

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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