Tested unit, found steam coming out of door, pulled exhaust apart, found nipple corroded. Pulled apart, replaced brass 90 and nipple supplied by customer. Tested unit, still leaking, found pressure switch, had constantly heating. Will order new and return. ***No charge travel, miles & labor, recall to work order 148600 1/22/18 Installed new pressure switch, found fill valve hose melted. Repaired, tested unit, filled heat, kicked in contactor, sparked, found burnt up. Told customer due to unit constantly heating and they were using wires got hot melted water line and water, took out contactor, will order new and return. 1/29/18 Installed new contactor, tested unit, ran up to temp, let cycle, found steam leaking out of door. Pulled door, adjusted tabs and switched exhaust plate around. Tested unit, now okay.