Just had the problem at all faucets on our 2006 Phaeton, a Suburban 10 gallon gas/electric. Check valve in hot water line behind heater had failed, dropping out a piece of the valve plunger that actually caught in the valve's spring. If yours is like ours it is attached using two sink supply nuts in PEX water lines. Bought the valve at a local Rv dealer for $8.65 including tax. Ours was behind a panel in the short bay in front of the passenger rear tire behind the WH. Had to unload bay and pull panel, had two screws on the inside behind the water heater. Now has a couple of 1 1/2" angles to attach to vertical member and two screws to attach where two staples were before.