I have old model Rinnai (REU 502) on my sailboat. The unit is 23 years old and has worked just fine until this year. The pilot lights on it but when the hot water runs through the system, the propane heaters fail to come on. We've unscrewed the screw where the propane enters and blew into it. there was good pressure. I took the tank to a dealer and it was almost full and had good pressure. I suspect however the system is not turning on when the water flows through it because something is either gummed up (after 23 years) or corroded or broken. Can any one make any suggestions? thanks, ron
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