Reliance water heater displays E9 and will not operate

Safety first: Turn OFF gas at the shutoff valve and disconnect power. Do not attempt to disassemble the gas valve body.

Steps to check:

• 1. Inspect wiring: Remove the access cover and inspect the wiring harness to the gas valve or gas control. Look for loose connectors, corrosion, or damaged insulation. Reseat all plugs.
• 2. Verify gas supply: Ensure the manual gas shutoff is open and that other gas appliances function normally. Low supply pressure can cause valve errors.
• 3. Check for external damage: Look for signs of impact, water damage, or burning on the gas valve body. Any such damage requires replacement.
• 4. Functional test (pro level): A technician can measure coil resistance and control signals to confirm valve failure. Homeowners should not attempt to open or repair the valve.
• 5. Replace gas valve: If wiring and supply are good and E9 persists, replace the gas control valve with the exact Reliance-specified part. Use approved pipe sealant, leak-test all joints with a soap solution, and follow lighting instructions.

Warning: Improper gas valve work can cause fire, explosion, or carbon monoxide poisoning. If unsure, hire a licensed gas technician.