Rheem water heater gas pilot keeps going out: What to Check and What to Do Next

Use only checks that match the exact appliance or system and its official guide.

1. Screen for an immediate gas or combustion hazard

   From outside the appliance enclosure, look and smell only from a safe position for a gas odor, hissing, smoke, soot, scorching, water around the control area, a damaged vent, or a flame that is not contained as the model's viewing window shows. Do not operate switches or create a spark if gas may be present.

   Expected result: There is no unusual odor, smoke, soot, water damage, abnormal flame, or visible vent damage; or any one of those hazards is present.

   Next step: If any hazard is present, leave the area when appropriate, follow the gas supplier or emergency guidance from a safe location, and do not relight or continue testing. If clear, continue only with ordinary-access observations.

   Stop if: Stop immediately for a gas odor, hissing, smoke, soot, scorching, uncontrolled flame, water on gas controls, or suspected carbon-monoxide symptoms; do not use an ignition source or electrical switch near suspected gas.

   Why this matters

   Why: A clean external check permits only limited identification and manual review. A gas, fire, combustion, water, or vent hazard is not a relighting problem and may make the appliance unsafe to operate.

2. Identify the Rheem model and ignition type

   Read or photograph the rating plate and the operating label from a dry, safe position without removing covers. Record the model, fuel type, whether the unit has a standing pilot with a visible pilot control or an electronic ignition, and the exact wording of any status indicator or code.

   Expected result: The unit is confirmed as a standing-pilot model with a model-specific lighting label, or it is an electronic-ignition or unfamiliar design with no safe user relight instruction.

   Next step: Use the exact Rheem manual or label only to understand the normal sequence; if the sequence is unclear, stop and arrange qualified service. Do not keep cycling the control or attempt a generic relight procedure.

   Stop if: Do not remove the burner cover, open a sealed combustion chamber, or operate a control when the model or lighting sequence is unknown.

   Why this matters

   Why: Rheem uses different ignition and gas-control arrangements across product families. A standing-pilot procedure must not be assumed for an electronic-ignition unit, and an unfamiliar design needs model-specific help before any operation.

3. Classify exactly when the pilot goes out

   Using only the model's normal observation window and only if there is no gas odor or other hazard, note whether the pilot dies when the control is released, immediately when the main burner tries to light, after the heater has run, or when a nearby exhaust fan, ceiling fan, door, or wind condition changes.

   Expected result: The outage follows control release, main-burner ignition, a draft or fan event, a long run, or no repeatable event.

   Next step: Record the timing and surrounding conditions, then stop repeated relighting and provide the record to a qualified technician or gas supplier. Do not change draft conditions, gas pressure, or pilot position as a test.

   Stop if: Stop observing if the flame lifts, rolls out, produces soot, changes color abnormally, or gas odor appears.

   Why this matters

   Why: Control-release outages make flame sensing, pilot flame contact, or the holding sequence more likely. A main-burner or draft-related outage makes pilot position, combustion air, venting, or gas-supply behavior more likely. A random outage still warrants service because the safety system is losing flame confirmation.

4. Check only the accessible combustion-air surroundings

   From outside the heater, look for stored items, lint, dust, plastic, or other material obstructing the manufacturer's labeled air-intake or clearance area, and note whether a powerful exhaust fan, room fan, closed room, or noticeable draft coincides with the outage. Move only loose items that are clearly outside the appliance and can be removed without touching the heater, vent, burner, or gas controls.

   Expected result: The labeled clearance and intake area are open with no unusual draft, or an obstruction, closed-room condition, or draft event is present.

   Next step: Keep the area clear and stop using the heater if the outage continues. Arrange qualified service for any suspected venting, combustion-air, negative-pressure, or room-ventilation problem; do not modify vents or add openings yourself.

   Stop if: Do not remove vent sections, alter intake screens, seal or enlarge openings, test draft with flame, or enter a confined or poorly ventilated space.

   Why this matters

   Why: Rheem's pilot-outage guidance considers combustion air and drafts as possible contributors, especially when the symptom follows a fan or venting event. Clearing loose storage does not prove the vent or combustion system is sound.

5. Observe the pilot flame only through the approved view

   If the exact Rheem model provides a normal viewing window and the area is free of gas odor, observe without opening or touching the combustion chamber whether the pilot appears stable and remains directed at the model's flame-sensing area. Do not poke the pilot, clean an orifice, reposition the assembly, or use a flame to test airflow.

   Expected result: The pilot is stable and consistently sensed, weak or wavering, lifts away from the sensor area, is not visible, or goes out as the main burner starts.

   Next step: Stop using the heater if the pilot cannot remain stable or the main burner triggers the outage, and provide the observation to a qualified gas-appliance technician. Follow no cleaning or adjustment procedure unless the exact Rheem manual assigns it to a qualified person.

   Stop if: Do not open a sealed combustion chamber, reach near the flame, adjust the pilot, remove a thermocouple or thermopile, or bypass the flame-sensing safety circuit.

   Why this matters

   Why: A weak or misplaced-looking flame, loss of flame contact, or an outage at burner ignition can involve the pilot assembly, thermocouple or thermopile, draft, gas supply, or control. A stable-looking pilot does not rule out a sensor or gas-control fault.

6. Stop repeated relighting and document the failure

   After one safe observation of the model's normal sequence, record whether the pilot stays lit, how long it remains lit, whether hot water returns, and whether the outage repeats without changing any gas, vent, or safety component.

   Expected result: The pilot remains lit normally, goes out again, the main burner never operates, or the unit enters a lockout or displays a fault indication.

   Next step: Leave the heater out of service when the pilot will not stay lit, contact qualified plumbing or gas-appliance service, and provide the model, outage timing, flame observation, draft conditions, and any indicator information.

   Stop if: Do not repeatedly relight, hold a control down longer than the model label instructs, or continue operation after a repeated outage or lockout.

   Why this matters

   Why: A single successful relight does not establish a repair. A repeated outage, failed burner start, or lockout indicates an unresolved flame-sensing, gas, combustion, venting, or control issue and should not be chased with repeated ignition attempts.