I'm having trouble knowing when the flame is lit when using propane for the refer. I've replaced the LED in the indicator panel to no avail. Can anyone tell me how to trouble shoot this electrical indicator ? The viewing window inside the refrigerator doesn't allow me to see any light either. The only way (other than waiting to see if the fins get cool) is for me to feel the outside flue cover to see if it warms up. Inconvienent to do when first lighting it. Thanks !