Thanks to everyone for the assistance. Here's where I am. I have good water flow into the hot water heater but no water coming out. If I turn the hot water heater bypass valve to "bypass" I have water coming through the faucets but it is obviously bypassing the hot water heater.
I connected my air compressor to the clothes washer hot water valve in an attempt to blow out the hot water line and I had no restrictions, the air blew through the lines into the hot water heater.
Based on your posts, it is obviously a bad check valve on the hot water output side of the hot water heater. I have attempted to locate this valve and cannot see it. Does anyone with a 40 AD model know where the check valve is located?
Also, how can I get access to this valve?
2017 Dutch Star 4369
Huey Pilot — Vietnam 1971-72
Author of ACE, The Story of Lt. Col. Ace Cozzalio
2016 Independent Publishers Book Awards Winner