I measured the voltage at the thermostat Rc to G and Rc to Y terminals, and they read 16.2V and 16.34V respectively. Shouldn't I be measuring 24V+/-? I purchased a Nest thermostat and it will not work properly at these unusual voltages.
Is there a
C wire at the thermostat? You should measure between
C for a proper voltage reading.
Y connects back to the other side of the transformer through the coil of the contactor, in the condensing unit.
G connects back to the other side of the transformer through the coil in the fan relay, in the air handler.
C connects directly back to the other side of the transformer.
The only way to get an accurate measurement of the transformer voltage, is to measure between