WATER HEATER PROBLEMSHere are some things to check out if you are having problems with your Atwood water heater (which is normally a very reliable appliance):
FLAME WILL NOT STAY LIT
First, you may want to try adjusting the burner tube, especially if you are not getting a strong blue flame.   Just loosen the set screw and push or pull the burner tube as required.   Sometimes, adjustment is needed due to vibration.   I have also found that adjustment is needed when there is significant change in altitude.
Second, the burner tube may require cleaning as it frequently attracts spiders and dirt.   Clean it with a wire or brush - do not just use compressed air.
NO FLAME, NO SPARK
You can test your thermal diodes with a simple VOM.   You should have dc continuity in one direction.
Before you replace your defective thermal diodes, you need to determine what caused them to fail.   A "flame reversal" of your burner is a likely cause....which is most likely caused by a dirty burner tube (see above).   Also, inspect the combustion area and the cumbustion air pathway and clean as necessary.
CAUTION: You are working with LP gas that can cause fire, explosion or asphysiation.   Seek qualified help if you are not sure of what you are doing!
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Submitted by Bob Cook