Electrolux CEI30EF5GS - TOUCH SENSOR TECHNOLOGY (TST) CONTROL SYSTEM; Troubleshooting The TST Panel

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The TST system utilizes a touch sensitive glass panel (photo A) to allow the user to control the upper
and lower ovens, warmer drawer and cooktop surface elements including the cooktop Warmer Zone
element. The TST panel is connected to the electronic oven control (EOC) and the electronic surface
element control (ESEC) system UIB (user interface board) via ribbon connectors. It is similar in
function to a membrane switch.
The TST control panel generates an electromagnetic eld around each touch pad. When this eld is
interrupted by touching the glass, the control panel communicates the selection information to the
EOC or ESEC system . The EOC or ESEC system then responds by signaling the oven relay board
or surface element control board to close the appropriate relays to perform the selected operation or
function.
NOTE: The TST system touch glass is a non serviceable part and must be replaced as a complete
assembly if found to be defective. The replacement glass panel will come attached to the frame and
will include ribbon connectors. (Photo B)
TOUCH SENSOR TECHNOLOGY (TST) CONTROL SYSTEM
Photo A
The TST control panel has ribbon connectors that link it to the EOC and ESEC 30 UIB. (Photo C).
If these connectors fail or become loose the TST control panel will not operate and under some
conditions will generate a fault code in the EOC or ESEC display window.
If the TST control malfunctions or fails to operate inspect and re-seat the ribbon connectors. If a
failure/fault code is present follow the diagnostic procedure for that code.
If no fault code appears but the EOC system does not respond when the TST panel is programmed
then the cause can be the EOC or the TST panel. Replace the EOC rst. If the problem remains
Troubleshooting The TST Panel
Photo B
replace the TST panel assembly.
If the ESEC does not respond when the TST
panel is programmed then the cause can be
the ESEC UIB or the TST panel. Replace the
UIB rst. If the problem remains replace the
TST panel assembly.
If only a single key is non responsive then the
TST panel is the most likely cause of failure.
Photo C
ESEC 30 UIB EOC
Touch Glass
Frame
Ribbon Connectors