GSW
Vent Draft / Combustion Spillage
GSW water heater shows signs of backdrafting (soot around draft hood, melted plastic, or exhaust smell)
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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
Blocked chimney or vent, Improper vent slope, Negative house pressure, Undersized or disconnected vent connector
How to Fix / Troubleshooting
Safety: This is a serious carbon monoxide hazard. Turn off the gas supply to the heater and other affected appliances and ventilate the area. Install or check CO detectors.
- Visual vent inspection: Check that the vent connector is securely attached to the draft hood and chimney, with proper upward slope and no sags.
- Check for obstructions: Look for bird nests, debris, or collapsed liners in accessible sections. Do not climb roofs without proper safety equipment.
- House pressure: Turn off exhaust fans and range hoods and retest draft with a smoke source at the draft hood. If spillage stops, consult an HVAC professional to correct negative pressure issues.
- Professional chimney service: Have a qualified chimney or venting contractor inspect and clean the vent system before returning the heater to service.
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Repair Difficulty
Professional Required
5/5
Required Part
Draft Hood and Vent Connector
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