I have several insteon switches that i can control through the app and the individual switches. I have one that will not switch off. The lights are connected to two switches, front and rear entry for outside lights. I have to flip the breaker to turn on and off. All the others work fine. System is about 2 years old. Any suggestions?
Since you had to turn the light off. By turning off the breaker. You have done a power cycle reset. In case it was in a confused state. You could try a factory reset but it sounds like that may not help.
Do the LED indicators go up and down on the switch, when the paddles are used? Showing the switch changed state but the lights are stuck On?
If the switch is a dimmer type. It sounds like the triac used to set the on level may have shorted.
If the switch is a on off relay type. The relays contacts maybe welded on.