State Select Pilot Light Won't Stay Lit
The Short Answer: A State Select standing-pilot tank that dies when you release the knob is a thermocouple (or thermopile) that is not proving flame. A pilot that will not light is gas, a clogged orifice, or a packed FVIR arrestor. These are AO Smith-family burners — not Rheem. If you smell gas, leave. Do not needle the orifice with the gas on.
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Search Intent & The Real Problem
You held PILOT until your thumb cramped. The flame was there. You released. It vanished. State Select is Lowe’s State / AO Smith hardware — same family as many Whirlpool pilots and Craftmaster gas tanks, not a Rheem pilot. Wrong burner door gasket, wrong thermocouple, CO path. Full gas tree: State Select gas troubleshooting. Generic stay-lit: will not stay lit.
Some electronic State Selects have no standing pilot. If the jacket says do not light with a match, believe it. Relighting a spark unit is how you fill a closet with gas.
What other guides get wrong
They copy a generic “clean the pilot with a needle” list onto an FVIR State Select. Pulling that burner without reseating the door gasket is a CO path. They treat every State Select as a standing pilot. They sandpaper a thermopile and call it a thermocouple. And they still describe cracking the union. Do not purge the line.
Step-by-Step Troubleshooting
Step 1: Jacket sticker, then one lighting cycle
- What to look for: PILOT / ON / OFF knob and a view port = standing pilot. Follow the sticker: OFF, wait five minutes, PILOT, hold, ignite, hold 30–60 seconds, release, then ON. Electronic controls with an LED and no port are not this procedure — count flashes instead.
- Required tools: The sticker on your tank. Flashlight.
If other gas appliances are dead too, this is a meter or LP bottle, not a State Select thermocouple.
Step 2: Lights while held, dies on release
| Clue | Cause |
|---|---|
| Strong blue flame on the tip, dies on release | Failed thermocouple or loose/overtight nut at the valve |
| Flame misses the tip | Bent thermocouple, weak pilot |
| Yellow cap, lazy flame | Orifice, lint, low pressure, FVIR screen |
| Latch holds, dies in a few minutes | Draft, FVIR, thermopile under load, overheat |
| Latch holds, main never opens | Thermopile millivolts or the valve’s main operator |
| Whoosh / bang when it finally lights | Delayed ignition — bang |
- What to look for: Eyes at the view port. Thermocouple systems typically make about 20–30 mV open-circuit. Thermopile (powerpile) systems live in the hundreds of millivolts and sag when the main opens.
- Required tools: The view port. A millivolt meter only if you are qualified.
The nut at the gas valve is finger-tight plus about 1/4 turn. Cranking it does not raise millivolts. It shears the fitting. A new thermocouple that still will not hold is the valve or the flame — after replacing the thermocouple.
Step 3: FVIR screen and the space around the tank
- What to look for: Lint felt under the tank, a garage full of sawdust, a closet with no combustion-air grille, pet hair packed in the arrestor. Flammable-vapor events (gasoline, rags, paint) lock some Honeywell/Resideo controls until a technician replaces them — chamber sensor.
- Required tools: Flashlight at the base. Vacuum the floor around the jacket. Do not open the sealed burner door.
A “tight” remodel that sealed the louvered door is a classic State Select-pilot complaint. Cold-weather downdraft is a different article — pilot in cold weather.
Step 4: Pilot orifice — do not improvise a gas jet
- What to look for: A pinpoint blue flame that used to wrap the thermocouple and now is a yellow match-head. That is orifice or pressure, not a tip you can sand into working.
- Required tools: None in your hands. Orifice cleaning is a burner-out, gas-off, licensed job on FVIR units.
A sewing needle through a live pilot is how people get a flare-up. Turning the temperature dial and watching the pilot die is a valve/thermopile load problem — pilot after turning the dial.
Step 5: After a tank swap, meter relight, or a multi-flash LED
- What to look for: New flex, air in the run, delayed ignition. That is not a thermocouple. Electronic State Select: 2-flash is commonly low millivolts; 7-style FVIR lockout is not a DIY wipe. Sticker on that valve is law.
- Required tools: Phone to a licensed gas fitter. Manometer work is licensed (about 3.5–7 in. w.c. natural gas / 10–11 in. w.c. LP — confirm the rating plate).
If it bangs, shut the cock. Repeated trials dump fuel into the FVIR chamber. Need it off? Shutoff.
When DIY Ends: Calling a Licensed Pro
Stop at odor, a bang, a valve that will not latch after one correct cycle, a melted door, and any electronic-ignition State Select. You may follow the lighting sticker and keep the arrestor area clean. Thermocouple replacement that requires pulling an FVIR burner, gas-valve swap, and manifold-pressure checks are licensed. AO Smith-family parts help a tech; they do not make this a hardware-store science project.
Frequently Asked Questions
Q: Why won’t my State Select water heater pilot stay lit? A: The thermocouple is not proving, the pilot flame is too weak to heat it, the FVIR screen is packed, or the gas valve is failing. If you smell gas, stop relighting and leave.
Q: Why does the pilot go out when I release the button? A: The gas valve is not seeing millivolts from the thermocouple. Holding the button longer will not create voltage from a dead sensor.
Q: Can I sandpaper a State Select thermocouple myself? A: A gentle wipe of an exposed tip is sometimes enough on older unsealed burners. On FVIR State Selects, pulling the burner to sand parts is a combustion-seal job — hire a licensed plumber.