AC LO means low voltage.Click to see full answer. Simply so, what does Lo mean on a thermostat? off scale low Furthermore, why does my thermostat flash Lo? If your thermostat keeps blinking during the normal operation of your AC, that usually means there’s an issue with the outdoor portion of the system. It’s basically been locked out, meaning that it has shut itself down and sent a signal to the thermostat letting it know there’s an issue. Subsequently, one may also ask, what does Lo mean on a White Rodgers thermostat? LO is shown in the display where the temperature is normally displayed. The temperature sensed by the thermostat is lower than the 40 F (4 C) lower limit of the thermostats display range. The display will return to normal after the sensed temperature raises to within the 40 to 99 F (4 to 37 C) display range.Why Does My Honeywell thermostat say low battery?If your Honeywell thermostat has an LED display, and it needs batteries, it usually has a low battery warning. This warning appears on the screen as a flashing banner that says “Replace Battery” or “Batt Lo.” If you ignore this, a blank screen is your last warning before the thermostat stops functioning.
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