Google Nest controls-thermostats — Google Nest learning and programmable thermostats that report power and delay conditions on screen Error Codes Directory

Nest delayed messages: the thermostat is rationing its own battery

A Nest thermostat that says heating or cooling is delayed has detected that its internal battery is low and is postponing the call while it charges. Nothing needs to be wrong with the heating system at all. The thermostat is protecting its own ability to keep running, and the question worth asking is why it is not charging. Applies to: Google Nest learning and programmable thermostats that report power and delay conditions on screen This covers Google Nest thermostats that draw charge from the heating system wiring. Behaviour differs between Nest generations and between installations with and without a dedicated common conductor, so the Google support material for your specific model is the reference. Owner-safe checks: Note how often the delay message appears and whether it is worse in cold weather when the heating runs more. | Confirm that the heating itself works once the delay expires, which separates the control from the appliance. | Check whether a battery or power message has appeared alongside the delay at any point. Qualified technician: Running a new conductor to the thermostat position, or altering connections at a Heat Link or equipment terminal, is electrical work for a qualified person. | Do not add a conductor at the equipment end without knowing what it lands on. Heating control wiring carries mains voltage on many United Kingdom installations.