Ante, answering some questions may help us help you:
There should be a black panel on one wall of the bay that your AquaHot is in. Are there any red LED's on its front? All lamps there should be green when the unit is on. If there is an issue with charging your coach batteries, a low battery lamp on the black panel may be on, and keeping your system inoperative. Lithium batteries are a different sort of animal, and the electronics need to be set up correctly; I'll leave that notion to others more familiar with them.
I might surmise a bad pump or mixing valve, but with neither coach heat at any outlet nor hot water, it sounds more like your burner is in need of service. Do you keep your diesel fuel tank relatively full? The generator and AquaHot fuel pickup tubes mount higher in the tank than the engine's tube, so you can always start the engine even after long camping stays.
As long as fluid is up to the minimum line (when cold) on the small tank in that bay, and it's "Boiler" fluid, you shouldn't need to be adding any unless there's a leak somewhere. Your engine has connections that circulate its coolant through the AquaHot, so do you have heat or hot water immediately after driving?
-Joel
https://www.campingworld.com/boiler--100f-antifreeze-gallon-72724.html?srsltid=AfmBOooYd9-4vyXRCwVQYqgXaORSTWUf25g2llctASNmfKOFU5Ii3Vqg
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