The sensor the thermostat reads to decide when to run the compressor. A probe that has drifted or failed shows up as a display reading that disagrees with a glass thermometer, short cycling, or an error on the panel — and it is a far cheaper first thing to replace than a thermostat.
Probes are not interchangeable between series even where the plug looks similar. Match it to your model.
Fitment
- TK Series — TK cabinets.
- TR20 — TR20 only.
- TR30 — TR30 only.
Teco is made in Italy and its spare parts are model-specific — check the model plate on the back of your unit before ordering. See the full Teco range, including the Teco TK aquarium chillers themselves.



