Heater causes noticeable vibration or rattling noises in the equipment area.

Safety first: Turn off power before tightening any components.

• Check cabinet screws: Tighten all accessible screws on the heater panels and base.
• Inspect fan/blower: Ensure the fan wheel is securely attached to the motor shaft and that no blades are bent.
• Level the heater: Confirm the heater sits flat on a solid, level pad. Shim if necessary to eliminate rocking.

If vibration persists, the fan or blower assembly may need balancing or replacement.