Locate the power switch for your furnace. This is often a light switch-like toggle located on or near the furnace unit itself. Flip the switch to the 'off' position to ensure the system is not running while you are working on it.
Step 2 · Turn Off the Furnace
Locate the power switch for your furnace. This is often a light switch-like toggle located on or near the furnace unit itself. Flip the switch to the 'off' position to ensure the system is not running while you are working on it.
