When a Rheem water heater’s pilot light continually goes out, it can disrupt daily routines and raise safety concerns. This guide explains common causes, practical troubleshooting steps, and when to call a professional. By understanding gas supply, safety components, and maintenance practices, homeowners can diagnose issues accurately and restore reliable hot water.
Common Causes Of A Pilot Going Out
Thermocouple Or Thermopile Problems: A faulty thermocouple or thermopile can fail to sense flame presence, causing the gas valve to shut off the pilot. Signs include a dim pilot flame, yellow or flickering flame, or the flame going out after a few seconds.
Gas Supply And Airflow: Low gas pressure, closed gas valve, or blocked gas lines can starve the pilot of fuel. Inadequate ventilation or blocked vents can also cause drafts that extinguish the flame.
Vent And Draft Issues: Dirty or blocked venting, improper chimney connections, or a negative pressure in the combustion chamber can pull air through the pilot, causing outages.
Dirty Or Obstructed Orifice: Debris or mineral buildup in the burner orifice can affect flame stability, particularly in areas with hard water.
Thermostat And Control Board Malfunctions: A faulty control valve or thermostat can misinterpret flame signals, resulting in the pilot being turned off.
Water Temperature And Sediment: Excessively high temperature settings or sediment buildup in the tank can alter combustion dynamics and flame stability.
Immediate Troubleshooting Steps
Safety first: if you smell gas or suspect a leak, evacuate and call the gas utility company or emergency services. Do not create sparks or use electrical switches until the area is safe.
Reset And Relight: Turn the thermostat to OFF, wait several minutes, then turn to PILOT. Follow the Rheem relight procedure in the user manual, keeping your face away from the flame and using the lighted match or ignitor as directed.
Check The Thermocouple: With the pilot lit, ensure the thermocouple tip is in the flame. If the flame is too small or flickering, gently bend the thermocouple toward the flame to improve sensing. If damaged, replacement is needed.
Inspect The Gas Supply: Confirm the gas shutoff valve is fully open. If there are multiple gas appliances, verify overall gas supply. A clogged regulator or stale propane can impede flow.
Vent And Draft Inspection: Ensure vents are clear and that the chimney is unobstructed. Look for signs of recent vent work or nesting that could affect airflow.
Clean The Pilot And Burner Orifice: With power off and gas off, remove the access panel and gently clean the pilot and burner area with a soft brush to remove dust and mineral buildup. Do not use a metal tool that could damage components.
Water Temperature Settings: Lower the thermostat to reduce strain on the system and observe if the pilot remains lit over a 24–48 hour period after adjustment.
When To Replace Parts Or Call A Pro
Thermocouple Or Thermopile Replacement: If the pilot flame is not detected despite proper lighting, or if cleaning does not restore operation, replace the thermocouple (older Rheem models) or thermopile (modern units) as recommended by the manufacturer.
Gas Valve Or Burner Assembly: A malfunctioning gas valve or dirty burner may require professional service. This involves testing gas pressures and ensuring safe ignition, which should be performed by a licensed technician.
Vent System Assessment: If improper venting is suspected (backdrafting, exhaust leaks), a pro should inspect the venting layout and chimney integrity to prevent carbon monoxide hazards.
Maintenance Tips To Help Prevent Relights
Routine maintenance can reduce pilot outages and extend heater life. Schedule annual professional inspections and follow these steps between visits.
- Replace worn thermocouples or thermopiles as recommended by Rheem or the technician.
- Flush the tank periodically to reduce sediment buildup, which can affect burner efficiency.
- Clean and inspect the venting system for blockages and ensure proper vent termination.
- Set a moderate water temperature (typically 120–130°F) to balance comfort, efficiency, and safety.
- Inspect gas lines for leaks using soapy water—bubbles indicate a leak; shut off gas and call a professional if detected.
Safety Considerations
Gas appliances require careful handling. If you smell gas, hear hissing, or suspect a leak, evacuate immediately and contact the gas company. Do not attempt to light matches or operate electrical devices in the area. Regular maintenance by a licensed technician is strongly advised to prevent dangerous conditions.
Helpful Reference: Quick Troubleshooting Table
| Symptom | Likely Cause | Recommended Action |
|---|---|---|
| Pilot goes out after lighting | Thermocouple misreadings or flame too weak | Adjust or replace thermocouple; ensure flame is centered |
| Flame extinguishes with draft | Vent obstruction or draft | Inspect and clear vent; ensure proper draft control |
| Gas supply blocked or low pressure | Shutoff valve partially closed or regulator issue | Open valve fully; call pro if pressure remains low |
| Persistent relighting required | Dirty burner or clogged orifice | Clean burner area; replace damaged parts as needed |
Frequently Asked Questions
How long should a Rheem pilot stay lit? In normal operation, the pilot should stay lit as long as the unit is powered and the burner is functioning. If it goes out repeatedly, it indicates an underlying issue that requires diagnosis.
Is it dangerous if the pilot keeps going out? Repeated outages themselves are not instantly dangerous, but gas leakage, improper venting, or ignition failures pose safety risks. Seek professional help if problems persist.
Can I relight the pilot myself? Many Rheem models allow user relighting with step-by-step instructions. If a gas smell or ignition failure occurs, stop and contact a qualified technician.
By understanding the root causes and following structured troubleshooting steps, homeowners can restore reliable hot water and minimize downtime. For persistent issues, professional service is the safest and most effective path to a long-lasting Rheem water heater performance.
