I have one of these units intertherm forced air furnace... my question is I have melted wires on two connections for the heating elements and the fan blows slower on heat cycle and when switching to air it speeds up and also one of the connection is and has a little arching I turned it off... is the sequencer bad or a nother problem:(

Fan is supposed to run slower in the heat cycle usually.

You will need to cut off and install new wire ends. This will cause an arc since the wires are not tight to the connection.