Indoor unit makes loud rattling or clicking noises when the fan is running.

Safety first: Turn off power and wait for the fan to stop.

Steps to try:

• Remove filters: Check for objects that may have fallen into the air intake.
• Inspect blower wheel: Shine a light into the blower and remove any visible debris.
• Tighten panel: Ensure the front cover and filter frames are properly latched and not vibrating.

When to call a technician: If the noise persists, the blower wheel may be cracked or the motor bearings worn and should be replaced.