# How to Disconnect the Coupling for a Furnace Thermostat
Furnace systems coupled to a wall thermostat let you adjust the temperature quickly, or set the time for the heat to turn on and off on some programmable models. Disconnecting the thermostat coupling takes only a few minutes using simple tools. Depending on the age of the thermostat, you may have a low-voltage model or a unit wired directly to a 120-volt circuit. For safety's sake, shut off power to the furnace before disconnecting the thermostat.
Things You'll Need
- Screwdriver set
- Masking tape
- Pen
Instructions
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1
Cut the power to the furnace at the circuit breaker.
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2
Raise the cover on newer wall thermostat models. On older models, the cover detaches and pulls off with gentle pressure.
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3
Remove the screws holding the thermostat mounting plate to the wall. Pull gently on the thermostat and turn it around to inspect the back panel.
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4
Label each wire connected to the back of the thermostat with a short piece of masking tape. Each terminal on the thermostat is labeled with a letter. Write that letter on the masking tape to label the corresponding wire.
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5
Loosen the coupling screws on the thermostat to pull off each labeled wire. You can now remove the old thermostat and replace it with a new unit.
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1
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