Tristar
Warming Plate Control Fault
Hot plate stays on too long or does not turn off automatically.
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Safety Warning
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.
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Possible Causes
Stuck relay on control PCB, Faulty warming plate thermostat, Firmware error in auto-off timer, Shorted control triac (on some models)
How to Fix / Troubleshooting
Safety first: Unplug the coffee maker when not in use to avoid overheating.
- Check timer settings: Verify the programmed keep-warm duration on your Tristar model and adjust if possible.
- Observe behavior: Time how long the plate stays on after brewing. If it exceeds the specified time, a control fault is likely.
- Internal inspection (advanced): Inspect the control PCB for a stuck relay (you may hear it click once but not release). Replacement of the PCB is usually required.
Warning: A hot plate that never turns off is a fire risk. Do not leave the unit plugged in unattended until repaired.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control PCB (Hot Plate Relay)
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