Why Does My VEVOR KZ-S6 Ultrasonic Cleaner Keep Heating Past the Set Temperature?
Exact model: VEVOR KZ-S6
Safety: Keep the tank filled within its marks. Mains/high-frequency internals must not be probed live.
A.
Start with the accessible checks
What this suggests: A KZ-S6 bath can grow warmer from ultrasound itself even after HEATING is off; that alone does not prove a faulty thermostat.
What to do
- Switch HEATING off and use a separate appropriate thermometer to track the water during a short ULTRASONIC-only run.
- Repeat a controlled heater-only test at an allowed setpoint, distinguishing normal acoustic self-heating from continuous electrical heating past the setpoint.
Still not fixed? Continue to the next check.
↑ Back to the repair pathsB.
If the problem remains after the first checks
What to do
- Correct a stuck mechanical knob, wrong panel setting or poor thermostat contact where accessible under safe service.
- An actual heater relay/thermostat fault needs matching KZ-S6 part and revision identification before replacement; published sources do not establish a universal controller pinout.
Confirm the repair
With heater off the temperature behavior matches controlled ultrasonic heat input; in a heater-only test it regulates near the intended setpoint without uncontrolled rise.