Reliance gas water heater burner will not light, but pilot stays lit

Safety first: Turn gas control to OFF and wait several minutes before working. Ensure adequate ventilation and avoid open flames.

Steps to check:

• 1. Verify pilot: Confirm the pilot flame is strong and stable. If weak, address pilot issues first.
• 2. Inspect burner: Remove the burner assembly per Reliance instructions. Check the main burner orifice for debris, rust, or spider webs. Clean with compressed air; do not enlarge the orifice.
• 3. Check manifold tube: Ensure the burner manifold tube is not kinked or blocked.
• 4. Test thermostat response: Turn the gas control temperature dial up and down while listening for a click or change. If the burner never receives gas despite a good pilot and clean burner, the gas control valve is likely defective.
• 5. Replace gas control: Remove the old gas control valve, following Reliance procedures, and install a new, model-specific gas control. Leak-test all joints with soap solution before relighting.

Warning: Incorrect gas work can cause fire or explosion. If unsure, hire a licensed gas technician.