We're sorry to hear about your experience, Fish. The Maestro MA-T51 countdown timer has a minimum load requirement of 0.3A for fans and 40W for incandescent or halogen light bulbs. Some new, energy efficient exhaust fans draw less energy and do not meet that 0.3A minimum load. If you have a new fan that doesn't meet the 0.3A minimum load, you might try the Maestro MA-T51MN countdown timer (Home Depot sku: 204655149). This timer will typically work better with newer fans because it has a 0.05A minimum load requirement for fans and 5W for incandescent or halogen light bulbs. However, the MA-T51MN does require a neutral connection (which allows for the lower minimum load).
If you still have questions or concerns, we're happy to help. Please give us a call at 1-844-LUTRON1. We're here 24/7, so feel free to reach out any time, day or night.
Matt @ Lutron Support