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OK I'm not at all very good at diagnosing a problem with commercial water heaters, I'd just not even work on them if I had a choice, but here is a question, need possible clues on what the problem could be on this heater, get to the job site, heater is fairly new, the temp on the heater upon arrival was 80, the sentinel was stuck on ECO and would not go into main valve light up, now to get it to reset and proceed though entire sequence we had to power off the Sentinel unit, after that it fired up, without a glitch, reached it temp of 140 and burners shut down, ran water to cool it down to test it and it cooled about 10 degrees less and then fires right back up, no glitches. Now I was not able to get the heater to repeat the problem, I was told that if the damper fails to open up, this will cause it to not fire, and if the damper is not it then it could be the sentinel brains starting to malfunction, looking for your thoughts, I told them to call when it happens again, I need to see it damper is in fact open or closed.
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