Southbend TVGS-32SC - Manuel (Page 32)

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ROUBLESHOOTING T RU V ECTION G AS C ONVECTION O VENS
P AGE 32 O WNER ’ S M ANUAL 1194658
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TROUBLESHOOTING GUIDE (continued)
Symptom Possible Cause Check or Replace
No power to ignitor. Check that voltage from ignitor module to ignitor is 24V. Ignitor draws
approximately 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 to ignition module. Should be 120V from temp control to ignition module.
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 motor comes through switch. Check switch.
Temperature control does not call for
heat.
Must read continuity between 6 and 7 on temperature control when
calling for heat.
Ignitor does not glow
red.
No power out of power switch. Check that unit power cord is plugged into power supply. Check switch
for continuity when switch is closed.
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 6" manifold water column pressure for natural gas, 10" for
propane.
First burner next to
ignitor lights, but flame
will not carry across to
other burners.
Burner orifices clogged. Make sure burner orifices are clear.
Bad flame sensor. Check in series on micro amps. Minimum is 0.75 amps, no maximum. Burners light but go out
within a few seconds.
(Ignitor will glow
approximately 4
seconds. If burner does
not ignite, ignition
module will try 3 times
and then lock out.)
Bad gas valve. Check gas valve.
No incoming electric power. Check incoming power.
Loose wire connections. Check wire connections.
Bad switch. Check fan switch.
Motor bad. If power is being supplied but motor will not turn, replace motor.
Blower motor will not
come on.
Shut down switch. All power comes through shut down switch. Check for continuity.