Southbend SL-Series - Manual (Page 35)

OWNER’S MANUAL 1199740 REV 1 (10/14) PAGE 35 OF44
G AS C ONVECTION O VENS
Symptom Possible Cause Check or Replace
Oven will not hold cor-
rect temperature.
Temperature probe not working. Resistance across temperature probe leads at room temperature (70°F)
should be approximately 1096 ohms.
Temperature control not calling for
heat.
When heat is required, there should be continuity between terminals 6 and 7
on temperature control.
Undersized gas supply line Oven requires 3/4” ID gas line.
Low gas pressure. Oven requires 7” manifold water column pressure for natural gas, 11” for
propane.
Inadequate or improper ventilation. Check ventilation hood. Verify draw and make up air adjustment.
Out of calibration. Calibrate according to procedure described on page 32.
Hot surface ignitor
glows red but burners
do not come on when
thermostat calls for heat
(cooking light is on).
No power to gas valve. Check for 24V from ignition box to gas valve.
Faulty main gas solenoid. Replace gas valve.
Faulty ignition module. Replace ignition module.
Manual shutoff valve closed Open all shut-off valve.
Manual valve on gas valve turned off. Open manual valve on gas valve.
Hot surface ignitor not in front of rear
end of burner.
Re-position hot surface ignitor to be in front of rear end of burner.
Hot surface ignitor does
not glow red.
No power to ignitor. Check that voltage from ignitor module to ignitor is 24V. Ignitor draws approx-
imately 3.35 amps at start as it heats up resistance goes down. Gas valve
opens approximately 1.8 amps.
Ignitor broken or cracked. Should read continuity between leads on ignitor.
No power or ignition module. Should be 24V from transformer to ignition module.
Check power to transformer. Should be voltage stamped on serial plate. Check between 3 and 6 on termi-
nal strip.
Check blower motor. Motor should turn
when power switch is turned on and
temperature control calls for heat.
Motor has centrifugal switch. Motor must be turning before ignition circuit is
energized. Power for motors come through contactors. Check contactors (one
for high speed, one for low speed).
Temperature control does not call for
heat
Must read continuity between 6 and 7 on temperature control when calling for
heat.
No power out of power switch.. Check that unit power cord is plugged into power supply. Check switch for
continuity when switch is closed.
First burner next to
ignitor lights, but flame
will not carry across to
other burners
Burners not aligned. Check burner carry over wings for proper mating.
Burner and orifice out of alignment. Orifice must inject gas down center of burner.
Gas pressure to low. Oven requires 7” manifold water column pressure for natural gas, 11” for
propane.
Burner orifices clogged. Make sure burner orifices are clear.
Table continues on next page.
T ROUBLESHOOTING G UIDE
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.
T ROUBLESHOOTING