Tristar Keypad Matrix / Control Logic Error

Buttons register the wrong function (e.g., pressing temperature changes time).

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Moisture or grease contamination on touch panel, Shorted traces in keypad matrix, Firmware corruption on main PCB

Safety: Unplug before cleaning or disassembly.

Clean panel:
- Wipe the control surface with a mild cleaner and dry thoroughly.
Power reset:
- Unplug for 10–15 minutes to clear transient logic errors.
Inspect panel (advanced):
- Open the control housing and check for moisture or residue on the back of the touch panel.
- Clean with isopropyl alcohol if needed.
Replace parts: Replace the touch control panel if mis-triggering persists. If still faulty, replace the main control PCB.

Medium 3/5

Touch Control Panel Assembly

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