18
Troubleshooting
Symptoms & Possible Causes
The following are charts of Symptoms and Possible Causes to aid in diagnosing faults with your unit.
Refer to the symptoms column to locate the type of failure then to the Possible Cause for the items to be checked.
To test for a possible cause refer to test to identify test procedures. Test indicated with an “*” should be done by a
Lang factory authorized service representative.
Possible Cause
Test
Product is cooked too
long
No test available, operational
condition
Failed Probe
Check probe for proper resistance*
Failed Circuit board
Confirm that Circuit board is getting
correct voltage and putting out
correct voltage*
Failed Transformer
Check both Primary and Secondary
coils for correct voltage*
Failed Contactor
Remove the wires from the
contactor coil and check for
continuity across the contactor coil
connection*
Ensure the contactor moveable
points move freely up and down*
Failed Motor
Confirm that motor is getting correct
voltage*
Failed or disconnected
safety thermostat
Check across the thermostat
connectors for continuity*
Failed Element
Confirm that Elements are getting
correct voltage and have continuity*
NOTICE
If an item on the list is followed by an asterisk (*), the work should be done by
a Lang factory authorized service representative.
USE OF ANY REPLACEMENT PARTS OTHER THAN THOSE SUPPLIED BY
LANG OR THEIR AUTHORIZED DISTRIBUTORS CAN CAUSE BODILY INJURY
TO THE OPERATOR AND DAMAGE TO THE EQUIPMENT AND WILL VOID ALL
WARRANTIES.
NOTICE
Service on this or any other Lang appliance must be performed by qualified
personnel only. Consult your Lang Authorized Service Agent Directory. You
can call our tech service number 314-678-6315 or visit our website
www.langworld.com for the service agent nearest you.
BOTH HIGH AND LOW VOLTAGES ARE PRESENT INSIDE THIS APPLIANCE
WHEN THE UNIT IS PLUGGED/WIRED INTO A LIVE RECEPTACLE. BEFORE
REPLACING ANY PARTS, DISCONNECT THE UNIT FROM THE ELECTRIC
POWER SUPPLY.
CAUTION
WARNING
Symptoms
Possible Cause
Power indicator is
not lit
No power to cord outlet
Oven unplugged from outlet
Failed Power cord or plug
Failed power switch
Failed indicator light
Oven will not heat
Power Switch is not “ON”
Failed Transformer
Failed Probe
Failed Circuit board
Failed Contactor
Failed Over-temperature Thermostat
Failed Element
Oven motor will not
run
Power Switch is not “ON”
Failed Transformer
Failed Contactor
Failed Motor
Product burning
Product is cooked too long
Failed Probe
Failed Circuit board
Product is under
done
Product is not cooked long enough
Failed Probe
Failed Circuit board
