Water Heater Not Getting Any Gas
The Short Answer: A gas water heater that is not getting gas is a closed cock, a control left OFF, an empty LP tank, a locked or starved meter, or a valve that will not open. It is not a reason to crack a union “to see if you have gas.” If you smell fuel, leave. If other gas appliances are also dead, call the utility. If only the heater is dark, prove the cock and the lighting card, then hire a licensed tech.
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Search Intent & The Real Problem
The tank is cold. You can hear a click, or you cannot. Forums sold you “air in the line” and a video of someone loosening a flare. Fuel either reaches the control or it does not. No flame at all is a different map — burner not lighting. Flame that lights and dies is won’t stay lit. This page is no gas to the heater. Furnace dead in the same hour is a shared meter, LP tank, or vent — both dead.
What other guides get wrong
They start with “bleed the union.” That is a gas release in a living space. They mix no-fuel with a dead igniter, so you buy a piezo for a locked meter. They tell you to soap-test fittings while the house already smells. And they quote one manifold pressure for every fuel: natural gas is typically 3.5–7 in. w.c. at the manifold; LP is typically 10–11 in. w.c. Confirm the rating plate. A manometer on a live train is licensed work.
Step-by-Step Troubleshooting
Step 1: Split “this heater” from “the whole house”
| What else runs | First look |
|---|---|
| Stove, furnace, dryer all dead | Utility / LP tank / meter / common shutoff — not the heater valve |
| Other gas appliances fine, heater dark | Heater cock, control knob, sediment trap, valve, igniter |
| Furnace and heater died together | Shared vent, shared meter, shared emergency switch — both appliances |
| Smell of gas anywhere | Leave. Utility from outside. Not a DIY |
- What to look for: LP gauge in the red. Meter index not moving when you try to fire. A lock or tag on the meter. The yellow or black gas cock at the heater: handle across the pipe is OFF.
- Required tools: Eyes, flashlight, the other appliances. No wrenches on gas.
A tank that heated water yesterday and went dark overnight is usually the cock, the control, empty LP, or a lockout — not “air that snuck in.”
Step 2: Prove the heater actually has a path for fuel
- What to look for: Gas cock parallel to the pipe (open). Control not in OFF or VACATION. Lighting card followed once: OFF, wait, PILOT or ON per that valve. ICON Bradford White: wait until the status LED dies before you retry — pilot reset. Electronic DSI / hot-surface: no standing pilot; a dark port after a click is still “did fuel open,” not a match-light ritual.
- Required tools: The lighting card on the jacket. Flashlight at the view port.
One lighting cycle. If it will not light and you smell nothing, stop clicking. Repeated piezo clicks into a dark chamber dump unburned gas if the valve is actually opening.
Step 3: Empty LP, locked meter, regulator — still not a fitting
- What to look for: Two 20 lb bottles with the automatic changeover on reserve and both empty. A 420 lb tank the delivery missed. Ice on a regulator after a hard draw (regulator freeze looks like “no gas”). Utility shutoff after a leak call or a non-pay. Shared 1/2” run that starves the heater when the furnace fires — that is a licensed sizing/pressure job, not a DIY flex swap.
- Required tools: LP gauge, eyes on the meter. Do not reset a utility-locked meter.
Manifold numbers again, for the tech: NG ~3.5–7 in. w.c., LP ~10–11 in. w.c., always vs the rating plate. Clocking a meter or hanging a manometer is not a homeowner step.
Step 4: Control will not open vs igniter vs lockout
- What to look for: Spark or glow with no blue is fuel or a valve that never opened. No spark and no smell is igniter, ECO, or lockout — still not an excuse to open a union. Standing-pilot thermocouple should make ~20–30 mV with the pilot lit; ICON-style thermopile is hundreds of mV. You do not measure those with gas leaking. FVIR screens packed with lint starve the burner so it looks like “no gas.” Status LED flash charts are brand-specific — Richmond gas valve, Rheem pilot.
- Required tools: View port, the flash-code sticker. Meter millivolts only with a licensed tech and a lit, stable pilot.
Do not jumper the thermocouple to “prove the valve.” That is how a failed safety becomes a fire.
Step 5: When the train itself is the failure
- What to look for: Control that never clicks open, a valve that hums and stays shut, water in the burner tray (tank is dead — shut the gas), or a flex that was kinked at install. Water dripping on the burner is a leak, not a fuel problem — dripping on the burner, bottom of the tank.
- Required tools: None for you. Gas-valve replacement, regulator, and pressure are licensed.
If the closet smells like gas when it tries to fire, that is not “not getting gas.” That is fuel leaving the wrong place. Leave.
When DIY Ends: Calling a Licensed Pro
You may open the heater cock, read the lighting card once, confirm LP and the meter, and photograph a status LED. Stop at any odor, any fitting, any manometer, any millivolt test you are not qualified for, and any lockout that repeats. A licensed plumber or gas fitter with a manometer beats a cracked union and a garage full of mercaptan. Same-day service is cheaper than a utility emergency from a “quick bleed.”
Frequently Asked Questions
Q: Why is my water heater not getting gas? A: Closed cock, control OFF, empty LP, locked or starved meter, or a gas valve that will not open. Confirm other appliances. Do not loosen fittings to check.
Q: How do I know if gas is reaching the water heater? A: Other gas appliances running is a clue, not a proof at the burner. A licensed tech checks pressure at the proper tap. A homeowner does not crack a union.
Q: Can air in the gas line stop a water heater from getting gas? A: Air after a meter relight or a new pipe can delay ignition. It is a licensed purge, not a DIY. A heater that ran yesterday does not “get air” overnight.