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If I go through this process would a Versaflow be a good idea to not be constantly running water through the heater? I suspect probably.

Thank you or your response. I'm pretty sure this is what I will find based on what I have seen so far. Is there any links or documentation on replacing the tube bundle? I havent checked for water yet inside (will do when it is light out again) but I suspect there will be.

Thank you for your reply. Yes I hope someone might give me some hints. I really have no idea how old it is. Would it have a mfg date somewhere or be associated with a serial number? I moved into the house 2 years ago and it was here. I only determined maybe it is a failed heat exchanger...

I get "Check IGN Steps" on the display and one flashing red LED on the ignition which seems to indicate "air flow fault". I checked the tubes and made sure no obstructions and the air flow sensor clicks when blown into. No obstructions on the blower black plastic housing either. I wiggled...