topic Constant HW ON signal in Nest Thermostats https://www.googlenestcommunity.com/t5/Nest-Thermostats/Constant-HW-ON-signal/m-p/223767#M44968 <P>I have a Nest 3rd Gen Learning thermostat. With both CH and HW selected OFF and the boiler switched OFF, something occasionally causes the Nest to send an open signal to the HW motorised valve. The valve doesn't like a permanent ON signal. It starts buzzing and overheating. It seems to be associated with this yellow icon on the screen for which I have failed to find any decode.</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Screenshot 2022-08-22 at 16.07.35.png" style="width: 231px;"><img src="https://www.googlenestcommunity.com/t5/image/serverpage/image-id/13305iE91D7F576CE354C1/image-dimensions/231x222/is-moderation-mode/true?v=v2" width="231" height="222" role="button" title="Screenshot 2022-08-22 at 16.07.35.png" alt="Screenshot 2022-08-22 at 16.07.35.png" /></span></P><P>I think it may be associated with a power cut or an interruption to the wifi signal.</P><P>Anyone know what's going on here and what I can do about it?&nbsp;</P> Mon, 22 Aug 2022 15:30:58 GMT Rich9 2022-08-22T15:30:58Z Constant HW ON signal https://www.googlenestcommunity.com/t5/Nest-Thermostats/Constant-HW-ON-signal/m-p/223767#M44968 <P>I have a Nest 3rd Gen Learning thermostat. With both CH and HW selected OFF and the boiler switched OFF, something occasionally causes the Nest to send an open signal to the HW motorised valve. The valve doesn't like a permanent ON signal. It starts buzzing and overheating. It seems to be associated with this yellow icon on the screen for which I have failed to find any decode.</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Screenshot 2022-08-22 at 16.07.35.png" style="width: 231px;"><img src="https://www.googlenestcommunity.com/t5/image/serverpage/image-id/13305iE91D7F576CE354C1/image-dimensions/231x222/is-moderation-mode/true?v=v2" width="231" height="222" role="button" title="Screenshot 2022-08-22 at 16.07.35.png" alt="Screenshot 2022-08-22 at 16.07.35.png" /></span></P><P>I think it may be associated with a power cut or an interruption to the wifi signal.</P><P>Anyone know what's going on here and what I can do about it?&nbsp;</P> Mon, 22 Aug 2022 15:30:58 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/Constant-HW-ON-signal/m-p/223767#M44968 Rich9 2022-08-22T15:30:58Z