The controls are on the glasstop and no way to access them from below, so the glass top has to be removed by removing any straps/braces from below and raising the rangetop housing above the counter height.
The foil tape connecting to the downdraft ductwork will need to be removed. Make sure you have foil tape to reseal this connection.
The black foam tape between the cooktop housing and the countertop will need to be separated with a putty knife. Be sure to have the 1/4” low density foam tape on hand for replacement.
Remove the 6 knobs by lifting them upward and then lift the housing above counter height.
The loosened housing can be supported by two pieces of 1x2 that straddle the opening. The sheet metal screws around the perimeter are easily removed and a putty knife under the glass should release the glass. Once the glass is removed, you’ll see an electrical control box with the 6 switches. The fan switch is held in place with two screws. The switch can then be accessed from the side and replaced. Just note the 4 colored wires and move them to the new switch. There’s a 5th contact that’s unused.
Reassembly is straightforward but you’ll need to remove any remaining foam tape, clean the underside and the countertop before applying the new tape.
