New, but bought a year ago as we "stockpiled" it for our upcoming renovation. Inside unit - not outside mount.

When we first hooked it up, it was giving us an intermittent ignition error code. We had Atmos out & they said they had the volume to run it but that it was probably the line size. We increased the size to 1" all the way (20' from the meter). It gave us some intermittent errors but then worked fine for a month. We figured problem solved.

This morning - no hot water & and the ignition error is back. It is still under warranty BUT we have no local repair people. They will send one from 50 miles away but since it is intermittent, we'll have to continue to pay service charges each time in hopes that it's happening when they get here.

Thoughts? Back to a standard unit? It's kind of a mess because they won't just replace it without one of their techs diagnosing the issue. I get it - could be low volume & not their fault.

Does gas pressure/volume fluctuate enough in a neighborhood to cause this problem?

AO Smith GT15-310C

Am going to love to read the solution to this mystery.

I can only submit memories given by landscape architect friends.
When ever my black thumb would quiz them on WHY a plant of mine didn't grow and what I could do about it,
they would simply say "that spot is not a good one for that plant". The end.

Over the years, I still wonder why a plant does well one place, not another, both spots look same to me.
Currently replacing Feb '21 freeze rosemary and hanging baskets.

Beyond a lucky visit where the tech catches the heater having a tantrum that delivers a solution,
I would be selling that problem child with caveats to someone in a big city, then solving water heating another way. That said, after years of DIY 80's plumbing woes, these days I love to give up and enjoy the results of first-class plumber's solutions. Additionally, if things go South and the main water valve must be shut off, a plumber can getRdone now, as opposed to me waiting for one to respond to my emergency, waiting without water.

Op was at 9:16 - it's back on.

Who knows.....

I seriously doubt that it's the supply pressure/volume from the supplier, but could be the regulator in the meter. Typical residential pressure is in the double digit PSI, and the meter drops it down to 8 inches water column (less than 1/3 PSI). Sometimes the meters need to be replaced, and might be worth a call to your gas supplier to have them check.

Quote:

---

might be worth a call to your gas supplier to have them check.

---

Will do. It's out again tonight.....

You need to have someone put a a manometer on the gas line to the water heater. Then get readings when it starts up. Also, turn on any other gas appliances in the house while the water heater is on and see what the readings show. This will tell you whether you have the proper range of supply.