ACV
Fan Imbalance / Mounting Fault
Water heater vibrates excessively or fan noise is very loud
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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
Debris in ACV combustion fan, Damaged fan wheel, Loose fan mounting screws, Resonance with flue system
How to Fix / Troubleshooting
Safety: Isolate power before accessing the fan or combustion chamber.
- 1. Inspect fan: Remove the combustion cover and check the ACV fan wheel for dirt, insects, or foreign objects. Clean carefully.
- 2. Check mounting: Tighten all screws and brackets securing the fan and flue collar.
- 3. Flue support: Ensure the flue is properly supported and not transferring vibration into the building structure.
- 4. Replace fan: If the fan wheel is cracked or bent, replace the complete fan assembly.
After repair, run the unit and confirm that vibration and noise are within normal limits.
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Repair Difficulty
Medium
3/5
Required Part
Combustion Fan Assembly
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