Aqua Hot not igniting on Monaco Dynasty

odds are you had a air bubble in the fuel line between the Filter and the Unit. It does not take long for a unit to cycle off on Diesel. It probably ran just long enough to use the fuel between the Filter and the Aqua Hot. Then setting a month, caused the air bubble to block off fuel. I was going to post previously. I was going to ask if you had a strong smell of Diesel by the exhaust OR you had Diesel dripping out the down pipe elbow for the exhaust. THAT would indicate fuel IS getting to the unit, but the spark is NOT happening. When it failed to start, IT DID time out and the webasto shut down after a few minutes? It should have. I usually have to run a flooded unit up to 1 hour to get rid of ALL accumulated residual diesel to get rid of all white smoke. And NO, the fuel nozzle should not have a problem from a month of inactivity. ALL Aqua Hots, need to be run monthly on Diesel and activate the furnace section also. This keeps the furnace section check valves from sticking. THIS is a usual cause when the Aqua Hot Furnace section is not used for a long time. Doug