John Wood power vent water heater displays E008 and cycles off shortly after starting

Safety: Turn off power and gas before inspecting venting and intake components.

• 1. Check intake termination: At the exterior intake hood, remove any screens or covers and clean out debris, leaves, or insect nests.
• 2. Inspect intake piping: Follow the intake pipe from the heater to the outside. Look for kinks, sags filled with water, or crushed sections. Repair or replace damaged sections.
• 3. Clean intake screen: Many John Wood blowers have a mesh screen at the air inlet. Remove dust and lint with a soft brush and vacuum.
• 4. Room air supply: If the heater draws air from the room, ensure there is adequate combustion air. Open louvered doors or add combustion air openings as per code.
• 5. Reset and test: After restoring proper airflow, reset the control and verify stable operation without E008 returning.