How to read a blasted resistor?
You can't, its gone, and if it got blasted there is a high probability that the coil is also been changed from the original value. 


Find another resistor that looks similar
Reverse engineer the circuit and see if there is a value that makes sense
Find another unit and get the resistor value from that 
Find a schematic from the manufacturer if possible. 


The biggest problem is: even if you do replace the resistor, there could be an underlying problem that could explode the new one, so it may not do you any good.