Atwood Water Heater No Gas Operation

Check for 12V DC at gas solenoids while spark electrode is firing.

Red wire from ECO to solenoid then to black wire (Grd)

Also check that all grounds are clean/tight
Main gas orifice is not plugged
Spark electrode gap is 1/8" and no cracks in ceramic insulator (unplug red wire on ECO to gas valve. Stick a fiber washer (some type of insulating material) between electrode and ground rod....fire unit. If you see a spark jumping from the ceramic to the ground rod or bracket, replace the spark probe

First check for spider webs in the line. Second I always have to light the stove and let it burn for a minute or so, Then try again. Make sure you are careful with open flames and propane. If the stove and furnace light most likely you have a block in the gas tube of the water heater check it out good.