Viessmann
Mechanical vibration / mounting issue
Furnace vibrates excessively or makes humming/rumbling noises during operation
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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
Unbalanced combustion fan, Loose mounting screws on boiler casing, Resonance in flue system, Pump cavitation due to air
How to Fix / Troubleshooting
Safety: Turn off power before tightening any screws or touching moving parts.
- Tighten casing screws: Check all accessible screws on the boiler casing and mounting bracket. Tighten any that are loose.
- Check flue supports: Ensure the flue is properly supported and not vibrating against walls or ceilings.
- Bleed pump and system: Air in the pump can cause noise. Bleed the pump (if vent screw present) and radiators.
- Fan inspection (technician): If vibration seems to come from the fan, a technician should inspect the fan impeller and bearings and replace the fan if necessary.
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Repair Difficulty
Medium
3/5
Required Part
Combustion Fan Assembly
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