Water heater vibrates excessively or rattles during operation

Safety first: Turn off power and gas before tightening any internal components.

Steps:

• Check wall mounting: Ensure the Saunier Duval heater is firmly fixed to the wall with all mounting points secure.
• Tighten internal screws: Inspect and tighten screws on the fan, burner, and heat exchanger brackets.
• Inspect fan: Check the fan impeller for damage or debris causing imbalance. Replace the fan if necessary.
• Support flue: Ensure the flue is properly clipped and supported to prevent it from transmitting vibration.

Warning: Do not operate the heater with loose components, as this can cause damage or gas leaks.