I have installed 3 Merrimack harbor breeze fans and they worked for awhile but stopped. Looked at the manual and did not see any dip switches for the fans. Turned the breaker on and off then back on. Set the dip switches the way they were and pressed the learn button after turning on within 30 seconds just as the directions read and they are still not responding. 2 fans turn turn on and off with the switch on the wall.. and one fan does not work at all. All lights are off and will not turn on at all. No strings to turn anything on and off. Help please