E011
John Wood
Flue Gas Spill / Draft Safety Switch Trip
John Wood power vent water heater shows E011 and the burner shuts off randomly
Advertisements
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Advertisements
Possible Causes
Blocked vent or chimney, Failed flue spill switch, Backdrafting due to negative house pressure, Improper vent termination
How to Fix / Troubleshooting
Safety: Flue gas spillage can expose occupants to carbon monoxide. If you suspect CO, evacuate and call emergency services. Turn off gas and power to the heater.
- 1. Check vent termination: Inspect the vent outlet for obstructions, damage, or improper installation. Clear any blockage.
- 2. Inspect draft hood and flue: For atmospheric-vented John Wood models with a spill switch, ensure the draft hood is properly seated and the flue is not blocked by debris or collapsed liners.
- 3. Test spill switch: Locate the flue spill or rollout switch near the draft hood. With power off, check continuity. If open and not resettable, replace the switch.
- 4. House pressure: Avoid running large exhaust fans (range hoods, dryers) without make-up air while the heater operates. Negative pressure can cause backdrafting.
- 5. Professional inspection: If E011 recurs, have a qualified technician perform a full combustion and venting analysis.
Advertisements
Repair Difficulty
Professional Required
5/5
Required Part
Flue Spill Switch
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements