I show where the fuse is located on the gas furnace control board and how to tell if it is blown
This video is part of the heating and cooling series of training videos made to accompany my websites: www.graycoolingman.com and www.grayfurnaceman.com to pass on what I have learned in many years of service and repair. If you have suggestions or comments they are welcome.
If you are a homeowner looking to repair your own appliance, understand that the voltages can be lethal, the fuels are highly flammable and high pressures are used. Know your limits.


  1. GFM found the fuse blown state when trying to run a trane XR80 for the first time this heating season….did something very stupid and put a 7.5 amp fuse in…when i attempted to start the furnace the board popped….i know. This summer i put a new digital thermostat in for this furnace. im guessing i just fried the board and still have a low voltage thermostat problem some where? thoughts? ideas?

  2. looks like a goodman circuit board, I have a problem with flame sensor, I replace the sensor,put  new circuit board, but the flame will not stay on, I probably want to change the wire harness for possible bad wire.