John Wood
Vent Leakage / Backdrafting
John Wood power vent water heater blower runs but there is a strong exhaust smell in the mechanical room
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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.
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Possible Causes
Loose or disconnected vent joints, Cracked vent pipe, Improper vent slope, Negative room pressure drawing exhaust back
How to Fix / Troubleshooting
Safety: Exhaust contains carbon monoxide. If you suspect CO, ventilate the area, evacuate, and call emergency services. Turn off gas and power.
- 1. Inspect vent joints: Check all vent connections from the heater to the termination for gaps, loose fittings, or missing cement.
- 2. Repair or replace vent sections: Replace cracked or damaged vent pipe with materials approved by John Wood.
- 3. Verify slope: Ensure vent slopes per installation manual to prevent condensate pooling.
- 4. Address room pressure: Provide adequate combustion air openings or reduce exhaust fan usage that may cause negative pressure.
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Repair Difficulty
Hard
4/5
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