- 1). Turn the circuit breaker off to the furnace. The circuit breaker is located inside your home's electrical panel.
- 2). Insert a screwdriver between the thermostat body and the wall. Twist the blade of the screwdriver to remove the thermostat body from the wall mount.
- 3). Place small pieces of masking tape on each individual wire, and label each wire with the corresponding letter stamped to the back of the thermostat terminals. Loosen the thermostat wire terminals with a screwdriver, and remove the wires from thermostat. Wrap the loose wires around a heavy nail to prevent them from falling into the wall cavity.
- 4). Use a screwdriver to remove the thermostat mounting plate from the wall.
- 5). Insert the wires through the new Honeywell thermostat mounting plate. Press the mounting plate flush against the wall, and secure it using the supplied mounting screws.
- 6). Connect the furnace wires to the new Honeywell furnace thermostat. Make sure you put each wire with its corresponding letter stamped on the back of the thermostat. Tighten each of the thermostat terminals with a screwdriver. Install new batteries into the Honeywell thermostat.
- 7). Hook the top of the new Honeywell thermostat to the top of the mounting plate. Snap the bottom into place until you hear it lock.
- 8). Turn the circuit breaker back on to the furnace. Set the thermostat controls according to the manufacturers instructions for your model of thermostat.
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