I did clean the items that you mentioned before and I noticed a ignitor needs to be replaced. I cleaned them any ways and it started the automatic regeneration but it stopped after 20 min. I will order those parts ASAP. Thank you so much for you help.
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Another thing when poking around in there: don't wipe off the face of the burner nozzle. Invariably, carbon gets mashed into the tiny orifices and makes it worse. Ignore face deposits, just spray brake cleaner through it.
You'll be replacing it this time around, but in 75k you'll want to try to clean it with brake cleaner. This is what Hino suggests, but I've had limited luck trying to clean them, and I've tried a dozen methods.
When tightening the tiny braided line, do not allow the line to twist and kink or it will immediately be destroyed. Use a backing wrench and do not over tighten it. It's easy to over tighten.
If you do these steps and it still won't burn, you need an actual diagnosis.
There's a part of the system called the atomizer. It does fuel and air mixing. It often develops faults with internal valves. Diagnosing this without appropriate software is basically impossible.
The burner mantle occasionally breaks.
The Combustion Air Valve occasionally sticks shut.
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