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Service Manual STG5/7 intelligent STW5/7 intelligent form 9123999 rev. 05/2010
TROUBLESHOOTING
Description of part Symptoms
Possible causes
Solving: checking/action
Outside door
Broken glass.
Slamming of door.
Give instructions to operator.
Fastening bolts and nuts
are loose.
Tighten all fastenings.
no sealing ring between
steel and glass.
Mount new glass with sealing
between glas and steel.
Door adjustment.
Door not well adjusted
and closes against bot-
tom side.
Adjust door on hinge and tighten
the hinge plate.
heating element
Warmer does not reach
adjusted temperature.
Wiring.
Check the wiring.
Check the power on the element.
Element malfunction.
Check the current with an AC cur-
rent tester. See table on page 30.
Thermostat
Warmer does not reach
adjusted temperature.
Wiring.
Check the wiring.
Thermostat malfunction. Check if the thermostat is making
contact.
Check the position of the thermo-
stat probe.
Warmer does not heat
up
Thermostat malfunction. Check if the drive shaft behind the
main switch is connected on the
thermostat.
Check if the thermostat is making
contact.
Thermometer
Temperature indication
differs from setting with
knob.
Thermometer malfunc-
tion.
Check the position of the ther-
mometer probe.
Check function after connecting a
new thermometer.
no indication on display. Battery empty.
Check battery.
Main Switch
no power to all, or some
oven controls.
Wiring.
Check the wiring.
Malfunction of the cams
on the switch.
Check the cams.
Contacts burned.
Check the contacts on the switch.
SERVICING AND REPAIRING Of ThE WARMERS STW5/7