John Wood power vent water heater displays E006 and shuts down during operation

Safety: Turn off power and gas. Hot exhaust components can cause burns; allow them to cool.

• 1. Inspect venting layout: Compare your vent length, diameter, and number of elbows to the John Wood installation manual. Correct any undersized or overly long vent runs.
• 2. Check for obstructions: Remove the vent termination cap and inspect for debris, insect nests, or ice buildup. Clean thoroughly.
• 3. Clean blower and intake: Dust and lint can reduce airflow. Remove the blower assembly if accessible and gently clean the wheel and intake screen with a soft brush and vacuum.
• 4. Test vent temperature sensor: Locate the exhaust temperature sensor (often a thermistor or high-limit switch on the vent collar). Check continuity or resistance per the service manual. Replace if open or out of spec.
• 5. Reset and monitor: After corrections, reset the control and monitor operation. If E006 recurs with proper venting and a good sensor, the control board or blower may be at fault and should be evaluated by a technician.