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ANSI Power Device Number


Power engineers call their relays by ANSI device number. If you do not know the ANSI device number, you will not understand what they are talking about. Below are the device number:

1 Master Element 2 Time Delay Starting or Closing Relay 3 Checking or Interlocking Relay 4 Master Contactor 5 Stopping Device 6 […]

Craftsman Garage Opener Light Did not Turn On


Craftsman Garage Opener

Craftsman Garage Opener equipped with a light. The light turns on when garage door opens or closes. However, after its original incandescent light burned out, a new compact fluorescent light (CFL) did not come on during operation.


Putting an incandescent light solved the problem. Apparently, Craftsman garage opener […]

Trane Furnace Open High Limit Device


Trane XR80 furnace did not produce heat. LED indicator inside its access panel blinked 4 times. Trane’s manual indicated “Open High Limit Device”.


The high limit device is the furnace temperature limit. It shuts down the furnace when its burner reaches high limit. Under normal temperature, it should be close to allow power […]