After having my heat exchanger replaced, I noticed another noise so ?I had them come out to check it again and the found another part that needed replacing that monitors the CO2 or something like that 🤣. Anyway if it goes out it’s safety valve shuts down your heater. Jorge found the problem immediately and mentioned it was intermittent and I said, YES! I hadn’t mentioned this before. Spot on! Got the new part, came back the same day and replaced it! No more worries, now!
