Dometic Blizzard H551816A721J Parts Diagram · Replacement
Air Conditioner · 2 assemblies · 2 diagram sheets · 23 parts · by Andrew Strick, mobile RV technician
OEM exploded parts diagrams for the Dometic Blizzard H551816A721J rooftop air conditioner: 2 assemblies (Replacement, Exploded View) and 23 manufacturer part numbers. 1 part is marked as superseded — the description gives the replacement number to order instead.
On rooftop units the model and serial plate is under the shroud on the base pan, and a second label usually sits on the ceiling assembly behind the return-air grille. Dometic model numbers are 8 digits (e.g. 57915.xxx); write down the full number including any suffix, because shrouds and control boards change with it.
