Electronic gas water heater displays E10; unit may not start or may shut down unexpectedly.

Safety: Use caution when working around live electrical circuits. Turn off power at the breaker when inspecting connections.

• 1. Check outlet and breaker: Verify the outlet has power and the breaker is not tripped. Reset the breaker if necessary and ensure any GFCI outlet is not tripped.
• 2. Measure voltage: Use a multimeter to confirm the heater is receiving the correct voltage (typically 120 VAC). Voltage significantly below or above spec can trigger E10.
• 3. Inspect power cord: Check the heater’s power cord for cuts, burns, or loose plug blades. Ensure the plug fits snugly in the outlet.
• 4. Dedicated circuit: Confirm the heater is on a dedicated circuit as recommended. Avoid sharing the circuit with large loads that can cause voltage dips.
• 5. Internal connections: With power off, remove the junction box cover on the heater and verify wire nuts are tight and no wires are burned or loose.
• 6. If voltage is correct: If supply voltage is stable and E10 persists, the internal power supply section of the control may be faulty and the gas control valve/control board assembly may need replacement by a technician.