SECTION 3

OPERATION

IV. QUICK REFERENCE: TROUBLESHOOTING

SYMPTOM

light is lit, food product is

undercooked

Oven will not turn on at all

Oven shuts down shortly

after it is turned on

PROBLEM

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

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

The gas burner did not light within 90 seconds of turn-

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.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Food products are

Controls may be set incor-

 

 

 

 

overcooked or

rectly.

 

 

 

 

undercooked.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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 to the “OFF” or “O” position, 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 to the “OFF” or “O” position, 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.

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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Middleby Marshall PS540 (Triple), PS540E, PS540 (Double) installation manual IV. Quick Reference Troubleshooting, Symptom

PS540 (Triple), PS540 (Double), PS540E specifications

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