Locate the main service panel in the house, which is usually located in the garage or utility room. Identify the water heater circuit breaker by following the labeled guide just inside the service panels door. The circuit breaker will be a large double pole (meaning one large switch connecting two poles/switches together).
Remove the screws in each corner of the cover panel, using the screwdriver. Set the cover panel and screws aside, using care to not touch any of the internal wiring.
Turn the multimeter on and rotate the selector dial to point at the 220 Volt AC (Alternating Current) setting.
Verify the breaker is turned off, as the breaker switch will be pointing to the labeled "off" side.
Touch the red test probe to the red wire connected to the breaker, and the black test probe to the black wire connected to the breaker. The reading on the meter should be zero. If there is any other reading on the multimeter, the breaker is faulty and will need to be replaced.
Turn the circuit breaker to the "on" position. Once again, touch the red test probe to the red wire connected to the breaker, and the black test probe to the black wire connected to the breaker. The reading on the meter should be 220 volts. If the meter reads anything else, the circuit breaker is faulty and will need replacing.
Replace the cover panel door and secure it by tightening the screws with the screwdriver. Turn the multimeter off.
Things You Will Need
- Multimeter (Digital or Analog)
- You can purchase a multimeter at your local hardware store or electronics store.