# Sensor switch does not hold on automatic

**URL:** <https://forum.ewelink.cc/t/sensor-switch-does-not-hold-on-automatic/24954>\
**Category:** Uncategorized\
**Created:** [November 25, 2023, 9:36pm UTC](https://forum.ewelink.cc/t/sensor-switch-does-not-hold-on-automatic/24954 "2023-11-25T21:36:05Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![endoherman](https://avatars.discourse-cdn.com/v4/letter/e/b5ac83/32.png) [@endoherman](https://forum.ewelink.cc/u/endoherman)\
**Post date:** [November 25, 2023, 9:36pm UTC](https://forum.ewelink.cc/t/sensor-switch-does-not-hold-on-automatic/24954/1 "2023-11-25T21:36:06Z")

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My THR316D temperature sensor switch works ok but I do not know what theeaning €{f the central knob (blue or not blue) and it does not stick to the automoc feature:jevery time I open it it is on manual and I wish to let it work automatically to protect my water supply against freezing  
Anybody knows what to do?