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Troubleshooting
Troubleshooting
ADJUSTMENTS AND SERVICE WORK MAY BE PERFORMED ONLY BY A QUALIFIED TECHNICIAN WHO
IS EXPERIENCED IN, AND KNOWLEDGEABLE WITH, THE OPERATION OF COMMERCIAL COOKING
EQUIPMENT. HOWEVER, TO ASSURE YOUR CONFIDENCE, CONTACT YOUR AUTHORIZED SERVICE
AGENCY FOR RELIABLE SERVICE, DEPENDABLE ADVICE OR OTHER ASSISTANCE, AND FOR GENUINE
FACTORY PARTS.
Warranty will be void and the manufacturer is relieved of all liability if service work is performed by other
than a qualified technician, or if other than genuine Southbend replacement parts are installed.
When any difficulty arises it is always a good idea to check that the oven has been connected to the type of voltage for
which it was manufactured. The serial plate is located on the inside of the lower front panel. It will list the type of voltage
for which the unit was manufactured. In addition, a wiring diagram is attached to the side of the fold down control panel,
as well as reproduced in this manual (See page 48).
Performance Standard
The typical time for the oven to heat from 75 °F to 350 °F is 7 to 8 minutes. The heating elements should come on when
the actual oven temperature drops to 10 °F below the temperature setting.
Troubleshooting Guide
The left column of the following table lists symptoms that indicate a problem, while the center and right columns list the
possible causes and appropriate corrective action. Note that the recommendations of this table assume that the wiring
connections are good. When checking a component, always check the wiring attached to the component as well.
Symptom
Oven will not hold correct temperature.
Blower motor will not come on.
46
PAGE
OF 76
Marathoner Gold Half-Size Gas Convection Ovens
WARNING
NOTICE
Possible Cause
Temperature probe not working.
Temperature control not calling for heat.
Inadequate or improper ventilation.
Out of calibration.
No incoming electric power.
Loose wire connections.
Bad contactors.
Motor bad.
Shut down switch.
INSTALLATION & OPERATION MANUAL 1177596 REV 3 (02/23)
Check or Replace
Resistance across temperature probe leads at room
temperature (70 °F) should be approximately 1096 ohms.
When heat is required, there should be continuity between
terminals 6 and 7 on temperature control.
Check ventilation hood. Verify draw and make up air
adjustment.
Calibrate according to procedure described on page 45.
Check incoming power.
Check wire connections.
Contactor pull in and supply power to motor. Verify
contactor pulling in.
If power is being supplied but motor will not turn, replace
motor.
All power except for motor supply come through shut down
switch. Check for continuity.
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