Bosch
Flue Gas Spillage / Incomplete Combustion
Bosch water heater causes carbon monoxide alarm to sound when operating
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 or disconnected vent, Negative building pressure causing backdraft, Improper venting materials or slope, Incorrect gas/air mixture
How to Fix / Troubleshooting
Safety first: Turn OFF the water heater immediately and ventilate the area. Do not use the heater until the cause is identified and corrected. Carbon monoxide is deadly.
- Inspect venting: Check that the vent is securely connected to the heater and intact along its entire length. Look for disconnections, holes, or corrosion.
- Check termination: Ensure the vent termination is not blocked by debris, snow, or other obstructions.
- Building pressure: In tight homes, exhaust fans can cause backdrafting. A professional should evaluate combustion air supply and building pressure.
- Professional combustion test: A qualified technician must perform a combustion analysis and verify proper gas pressure, air supply, and venting configuration.
Advertisements
Repair Difficulty
Professional Required
5/5
Required Part
Vent Pipe / Flue System
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements