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 the touch panel, Shorted traces in the keypad matrix, Firmware corruption on the main PCB

Safety: Unplug the unit before cleaning or disassembly.

Clean panel:
- Wipe the control surface with a mild cleaner and dry it thoroughly.
Power reset:
- Unplug the unit 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 the issue is still present, replace the main control PCB.

Medium 3/5

Touch Control Panel Assembly

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