There are many reasons why a Minka Aire wall control might not be working. First, check to see if the switch is operational. If it is operational and the fan is off, then it may be that there is a faulty connection between the switch, fan, and circuit breaker. If the fan is already on, a faulty wall control may be causing the issue. In order to troubleshoot this further, remove the wall control and replace it with a known good one. Alternatively, if you do not have any other Minka Aire wall controls, you cancontact MinkaAire for assistance in determining the cause of failure.