I need to change out the heat exchanger o-rings or seals, as its leaking water inside the unit, ans putting the pilot flame out. It has a auto pilot, but I can't seem to keep it lit. I have a pool tech here onsite, ( I am a Maint. Tech. for an Apt. complex), who says there should be about 16 seals, but in the manual I can only find 2 different sets of o-rings. Help. Am I looking at the wrong page, or does heat not know what he's talking about? Your immediate response would be greatly appreciated. Thanx in advance. Ed H.