Electronic gas water heater displays E06; unit may not power up correctly or may lock out immediately.

Safety: Turn off power at the breaker and shut off gas before servicing. Do not attempt board-level repairs.

• 1. Power cycle: Disconnect power for at least 5 minutes to allow the control to fully discharge. Restore power and see if E06 clears.
• 2. Verify supply voltage: Use a multimeter to confirm correct line voltage at the heater (typically 120 VAC for powered gas models). Avoid using long, undersized extension cords.
• 3. Inspect control connections: Remove the control access cover and check all plug-in connectors to the gas control valve/control board, blower, sensors, and igniter. Reseat each connector firmly.
• 4. Check for moisture or corrosion: Look for signs of water leaks above the control, condensation, or corrosion on terminals. Correct any leaks and dry the area thoroughly.
• 5. Replace control assembly: If E06 persists after verifying wiring and power, the gas control valve/control board assembly is likely defective. Replacement should be performed by a qualified technician, as it involves gas piping and leak testing.