IV. QUICK REFERENCE: TROUBLESHOOTING
ENGLISH
SYMPTOM
light is lit, food product is
undercooked
Oven will not turn on at all
"RESET" (
) switch is illuminated, oven will not heat
(gas ovens only)
appears in display, oven is not heating
Oven will not heat
Oven is operating, but little or no air is blowing from air fingers
Conveyor moves with a jerky motion, or will not move at all
Food products are
overcooked or undercooked.
PROBLEM
The oven temperature ex- ceeded 343°C, and the burner or heating elements were automatically 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.
The oven did not reach 93°C within 15 minutes of startup, and the oven has stopped heating.
Controls may be set incor- rectly.
Air fingers may have been reassembled incorrectly after cleaning.
Conveyor may be jammed on an object in the oven, or conveyor belt or drive chain tension may be incorrect.
Controls may be set incor- rectly.
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.
•Press the "RESET" (
) switch (repeatedly if necessary) to attempt to light the burner.
•If the burner does not light within 15 minutes, the oven will enter a safety lockout mode that disables the "RESET" (
) switch. If this occurs, turn the "HEAT" (
), "BLOWER" (
), and "CONVEYOR" (
)switches to the "OFF" ("O") position. Wait for AT LEAST FIVE MINUTES before restarting the oven. Then, repeat the Daily Startup procedure.
•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 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.
•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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