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The most common reason for error code e73 / no power to Rc wire detected to appear on the Nest Gen3 display is usually due to AC outdoor unit/compressor shutting down which in turn shuts down [...]

In majority of the cases, the Nest would NOT work out of the box with UAE based AC systems. Nest is designed to work with US air conditioning systems that are very different in nature than GCC or [...]

Nest Gen3 Thermostat (U.S version) general requirements Nest Thermostats are designed to work with 24V US spec AC systems. They require installation of a conversion kit as well as bypassing of [...]