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Original Poster: Trevor Neal
To Google Support re Nest thermostat malfunction
We have a 2nd generation Nest Learning Thermostat, mounted on a base, that has suddenly failed, after a number of years of faultless service.
I have tried the usual HeatLink reconnection, including inputting the six digit code to the thermostat but there is still no connection. Neither the HeatLink nor the thermostat were moved from their usual positions.
Initially the thermostat showed a W5 error, but this was not resolved after moving it closer to the wireless router. I might point out that other wi-fi devices work, and mobile phones and laptops all connect to the router. The router has not been changed and the wi-fi signal by the HeatLink is strong. I have checked the info on the thermostat, in particular the battery voltage, which shows 3.963V. Restart, presumably with any software update (it is 5.9.4-5), has not resolved the failure. Clearly nothing will change without a wi-fi network connection.
The thermostat now shows an H1 error code and the HeatLink status light remains yellow.
I have moved the thermostat close to the HeatLink but there is still no resolution of the failure.
I have read through threads posted by other users and have tried some suggestions, but all to no avail. It therefore seems that there is an irreparable failure in the thermostat, and I therefore ask you to replace the unit.
I look forward to your reply,
Trevor Neal