Rheem Pilot Light Will Not Stay Lit
The Short Answer: If a standing-pilot Rheem (and Ruud/Richmond twins) lights while you hold the knob and dies when you let go, the thermocouple is dirty, out of the flame, or dead. If it will not light at all, look at the gas cock, a clogged pilot orifice, or a packed FVIR screen. Many 2010-and-newer Rheems have no standing pilot — they spark or use a hot-surface igniter. Relighting a unit that has no pilot is how you fill a closet with gas.
Licensed local technicians
Rheem pilot will not stay lit?
Connect with a licensed 24/7 technician in your zip code right now.
Search Intent & The Real Problem
You held the gas-control button until your thumb cramped. The flame was there. You released. It vanished. That millivolt circuit is a thermocouple (or thermopile on some electronic valves) proving flame to the gas valve. A second common Rheem failure is the FVIR flame-arrestor at the bottom of the tank — lint and pet hair choke combustion air so the pilot cannot hold. If the tank is cold and you smell fuel, this is not a YouTube relight.
What other guides get wrong
They give one relight ritual for every Rheem ever built. Electronic-ignition Rheems have no pilot to clean with a needle. They also tell you to pull the burner and sandpaper the thermocouple as step one. On an FVIR Rheem the burner door gasket is a combustion seal — a botched reseat is a CO leak. They skip “smell gas, leave.”
Step-by-Step Troubleshooting
Step 1: Confirm you actually have a standing pilot
- What to look for: Rating plate and the lighting sticker on the jacket. Knob with PILOT / ON / OFF and a view port = standing pilot. No view port, a spark module, or “do not light with a match” = electronic. Electronic no-heat is a different path — Rheem not heating.
- Required tools: Flashlight, phone photo of the sticker.
If the sticker says wait five minutes after shutdown, wait five minutes. That is not optional.
Step 2: Gas cock, then one lighting attempt
- What to look for: Appliance shutoff handle parallel to the pipe (open). LP tank not empty. Other gas appliances lighting. Follow the jacket instructions: knob to PILOT, hold, spark or match at the port, hold 30–60 seconds, release.
- Required tools: The jacket instructions. A long lighter only if the sticker allows it.
If it never appears, stop. A clogged pilot orifice or a closed cock is not a tenth match.
Step 3: It lights, then dies when you let go
| Clue | Cause |
|---|---|
| Flame present, dies on release | Thermocouple not proving (dirty, bent out of flame, failed, loose nut) |
| Tiny yellow cap, will not wrap the tip | Pilot orifice or low gas pressure |
| Lights, runs, dies minutes later | FVIR screen, thermopile, overheat / ECO, draft |
| Lights with a whoosh / bang | Delayed ignition — shut down |
- Required tools: Eyes at the view port. No burner teardown yet.
The thermocouple nut at the valve is snug plus about a quarter turn. Gorilla-tight cracks the fitting and still will not latch.
Step 4: FVIR screen and combustion air — look, do not rebuild
- What to look for: Dust mat under the tank, a closet with no combustion air, a new coat of paint over the arrestor, a water heater in a garage with a lawn mower next to it (flammable-vapor sensor trip).
- Required tools: Flashlight at the base. Vacuum around the jacket from outside. Do not unscrew the sealed burner door unless you are licensed to reseal it.
A tripped flammable-vapor sensor on some Rheem controls will not let the pilot stay. That is a control replacement after you find why vapors were there — not a reset loop.
Step 5: When “air in the line” is the excuse
- What to look for: New flex, new tank, or a meter relight in the last 24 hours. Delayed ignition or a pilot that will not start after a swap.
- Required tools: None on the fittings.
Air after a reconnection is real. Cracking the union in a closet is how garages fill. Do not purge the gas line yourself.
When DIY Ends: Calling a Licensed Pro
Stop at gas odor, delayed ignition, a valve that will not latch after one correct lighting attempt, a melted burner door, and any electronic-ignition Rheem. You may confirm the shutoff, follow the jacket lighting sticker, and keep the area around the FVIR screen clean. Thermocouple replacement that requires pulling an FVIR burner, gas-valve swap, and manifold-pressure checks are licensed. A Whirlpool that behaves the same is a different burner family — Whirlpool pilot.
Frequently Asked Questions
Q: Why will my Rheem water heater pilot not stay lit? A: The thermocouple is not proving flame, the pilot orifice is weak, the FVIR screen is packed, or the gas valve is failing. If you smell gas, do not keep relighting.
Q: How long should I hold the Rheem pilot button? A: Follow the jacket sticker — typically 30–60 seconds after the flame appears. Holding it for five minutes does not fix a dead thermocouple.
Q: Can I sandpaper the thermocouple myself? A: A light wipe of the tip is sometimes enough on an older non-sealed burner. Pulling an FVIR burner assembly to “clean it” is a combustion-seal job. If the first relight fails, hire a licensed plumber.