I ran out of hot water yesterday. Checked the heater, and the pilot was out. Relit it (piezoelectric igniter), and it wouldn’t stay lit. So I went to Home Depot and got a new thermocouple. After I replaced it, now it won’t light. So, either igniter, or not getting gas (neither of which should be the result of changing a thermocouple).
Sigh…
[Update a couple minutes later]
OK, I’m seeing a spark when I hit the button. Hoping that maybe I just have to clear some air out of the pilot line from when I removed the assembly to replace the thermocouple.
[Update a few more minutes later]
Disconnected the pilot line, definitely gas coming out of the valve. All I can think is that I clogged it somehow when I changed out the thermocouple. I’ll try inspecting and cleaning it.
[Update a couple minutes later]
I can blow through the line, but there’s a lot of resistance. Don’t know if that’s normal, or if it’s too much for the gas pressure to overcome.
[Update a few minutes later]
When I hook the line back up, and open the pilot valve, I can faintly smell gas at the tip, but I don’t hear a flow. It’s more like seeping, and probably not enough to sustain a flame. Not sure where the problem is, though. Might see if I can just replace it.
[Update a while later]
Took it apart, put it back together, tested it outside the unit, and saw a pilot flame. Put it back in and didn’t see much, but there was a dim light in there. I turned the heater on, and apparently there was sufficient pilot to make it work. It was probably working before, and I just hadn’t realized it…