AC Fuses Box

If there is the voltage on the “line” side, test for voltage on the “load” side of the fuses by placing the meter’s leads on the load wire lugs. If you read voltage on this side(220-240V), this means the current is flowing through the fuse. If you get a zero-voltage reading on the load, this means your fuse is blown.

Where is the AC Fuse Located? The AC fuse on most HVAC systems is typically on the unit’s control board. You’ll normally find the board behind an access panel on the unit’s lower compartment. While you sometimes have to unscrew areas to access the control board, others have clips.

Typically, AC systems use “TR”-type fuses to ensure safe system operation. However, if you’re in a pinch and need to replace a fuse quickly, you can use a fuse that is rated for a lower amperage than what the system is rated.

1. Turn off your air conditioning system using the thermostat. …
2. Search for the breaker box. …
3. Shut off your AC unit at the breaker. …
4. Wait at least a full minute before switching the breaker back to the “on” position.
5. Wait for 30 minutes before turning your unit back on at the thermostat