Thermostat Voltage Readings

A thermostat with nc contacts should open eventually and the reading on the lcd should swing from 0 00 ohms to ol a thermostat with no contacts should eventually close and the lcd readout should swing from ol to 0 00 ohms.

Thermostat voltage readings. This is the current voltage of your thermostat s internal rechargeable battery. If the thermostat does not respond in this way it is bad and needs to be replaced. Nest thermostat update and voltage measurements. Where does a wall thermostat get its electrical power what voltage level is usually required.

The reading should be between 110 and 120 volts. If your thermostat isn t receiving enough power to charge the battery and it falls below 3 6v your thermostat will turn off wi fi. While most thermostats use a 24v dc circuit some use different voltage levels and or 120v ac is used by line voltage thermostats. Replace the upper thermostat.

The line voltage feeding the furnace to operate the fan blower motor is transformed down to a safer level of 24 volts the gas control valve needs 24 volts to open and after making a series loop through at least one safety device the most basic and mandatory one is an over temperature shut down the power goes up to the thermostat and. Also you will use a line voltage stat for cove heaters and in ceiling radiant heat. Heating or cooling room thermostat voltage levels power sources. If the meter reading shows the input voltage to the water heater the lower thermostat is defective and must be replaced.

If either test results in a 0 voltage reading the lower thermostat is bad and needs to be replaced. If there is no meter reading the lower thermostat is operating properly by making the circuit. The nest charging problem has been solved by connecting the c ac common wire from my furnace to the nest. If it isn t the upper thermostat is not sending power to the lower one.

Repeat the test with the other screw. They re the type of thermostats to use with our baseboard and wall heaters. I have had my nest gen1 for almost 16 months now and i probably could not go back to a regular dumb thermostat given the choice.