E15 displayed, unit may not fire or may shut down intermittently.

Danger: Gas valve work must be done carefully to avoid leaks and explosion risk. If you smell gas, shut off the gas supply, evacuate, and call the gas company.

• 1. Verify gas supply: Confirm the manual gas shutoff is open and that other gas appliances operate normally.
• 2. Inspect wiring: With power off, check the harness from the control board to the gas valve. Ensure connectors are tight and wires are not damaged.
• 3. Visual inspection of valve: Look for signs of overheating, corrosion, or physical damage on the gas valve body.
• 4. Do not attempt internal repairs: Gas valves are not field-repairable. Do not disassemble the valve.
• 5. Professional testing: A qualified technician should verify gas pressures, check valve coil resistance, and confirm correct valve operation. If E15 persists, the gas valve and/or control board will likely need replacement.