We have an Efel Diesel stove that we have had for 17 years (I call it a red diesel burning stove, when I order the diesel). Anyhow, it was working fine two days ago and now all of a sudden the flame is barely high, it is barely putting out heat, and the glass is cloudy so you can hardly see inside the stove! We thought it was plugged so we turned the coking knob and it still is not flaming up and we turned the stove up also. Help please