Display goes blank or shows “PF” when starting cooling or heating Unit running backwards – cooling on heat demand, heating on cool demand Unit runs both heat and cool at the same time
What does the G MEAN on a thermostat?
Thermostat Terminal Letters. G: The G terminal controls the fan relay and is responsible for turning the blower fan on and off automatically or manually via the thermostat. RC: The RC terminal is the 24-volt cooling power supply. RH: The RH terminal is the 24-volt heating power supply.
What are the terminals on a thermostat for?
Refer to the thermostat manufacturer's wiring diagram for precise connection information. G: The G terminal controls the fan relay and is responsible for turning the blower fan on and off automatically or manually via the thermostat. RC: The RC terminal is the 24-volt cooling power supply. RH: The RH terminal is the 24-volt heating power supply.
What does W/B mean on a thermostat?
When the thermostat calls for cooling, signals are sent to power up the condenser and the blower fan, cooling your home. W/B: The W/B terminal controls the heat relay or valve. When the thermostat calls for heat, a signal is sent to power up the furnace and the blower fan or the boiler, heating your home.
What is the connection between the thermostat and the furnace?
Between the thermostat and the heating or cooling equipment is a set of low-voltage wires that are connected to the thermostat control terminals and the terminal screws on the furnace or air conditioner control terminal strip.
What is a thermostat?
A thermostat is wired to a furnace or air conditioner unit and acts as a switch to turn the unit on and off automatically , based on the thermostat's temperature setting and/or programmed time schedule.
What is the G terminal on a fan?
G: The G terminal controls the fan relay and is responsible for turning the blower fan on and off automatically or manually via the thermostat.
How many wires do you need for a thermostat?
Some new thermostats require no more than two wires and will work fine if the extra wires are left unattached. Your thermostat may also have extra terminals that don't apply to your particular HVAC system; again, it is not a problem if not all the terminal connections are used.
What is a Y/O terminal?
Y/O: The Y/O terminal is used to control the cooling condenser. When the thermostat calls for cooling, signals are sent to power up the condenser and the blower fan, cooling your home.
What is Y1 in heat pump?
Y1: The Y1 terminal is used for the compressor contact in a single-stage heat pump installation.
Can you use a transformer to wire a thermostat?
Most thermostat wires operate on 24-volt power provided by a transformer, and they are generally safe to work on without shutting off the circuit feeding the thermostat wiring. However, if the low voltage wires touch each other during the work, the system's internal fuse will blow.
Is a thermostat a low voltage device?
The thermostat that is used to control the heating and cooling (HVAC) system in your home is a low-voltage device that is easy enough to replace. And replacing one is a very common project, as homeowners swap out older thermostats requiring manual adjustment with newer programmable thermostats that change temperatures automatically at preset times.