This Takes the Phrase "Rat's Nest" to a New Level

Swimming pool heater overtaken by rats

I received a call about a pool heater that would not fire.  Sure enough, I arrived at the property and attempted to start the heater and it would not light.  I then took the covers off the heater and WOW!  There was nothing but leaves, fur, and turds.  The heater was so packed that the debris kept the original shape of the heater even with the covers off.  Needless to say, there was not much troubleshooting required.