Water heater vibrates excessively or makes loud humming or rattling noises during operation.

Safety: Turn off power before tightening or adjusting mechanical components.

• 1. Check mounting: Ensure the Triangle Tube unit is securely mounted to the wall or floor. Tighten any loose brackets or bolts.
• 2. Inspect blower: Listen closely to determine if the noise originates from the combustion blower. If so, check for debris in the fan wheel and ensure all mounting screws are tight.
• 3. Support vent piping: Long runs of PVC or polypropylene vent can vibrate. Add or adjust pipe supports to prevent resonance.
• 4. Pump cavitation: A loud growling noise from the circulator may indicate cavitation due to low pressure or air. Increase system pressure slightly and bleed air from the pump and system.
• 5. Professional balancing: If the blower wheel is damaged or unbalanced, have a technician replace the blower assembly.