V. QUICK REFERENCE: TROUBLESHOOTING
SYMPTOMPROBLEM
SOLUTION
ENGLISH
light is lit, food product is
undercooked
Oven will not turn on at all
Oven shuts down shortly
after it is turned on
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" (or 
) Switch to the “ON” (or "I") position. This automati- cally engages a safety lock- out mode.
•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" (or 
) Switch is in the “ON” (or "I") position. The burner cannot engage until the blowers are in operation.
•Turn the "HEAT" (or
), "BLOWER" (or 
), and "CONVEYOR"
(or 
)switches to the "OFF" (or "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" (or 
), "BLOWER" (or 
), and "CONVEYOR"
(or 
)switches to the "OFF" (or "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.
•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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