Poolex pool heater is running but makes loud rattling or vibrating noises.

Safety: Turn off power before tightening any screws or touching moving parts.

Steps:

• Inspect panels: Check all access panels and top covers for looseness. Tighten screws evenly.
• Check fan blade: Look for bent blades or debris stuck to the fan. Clean and straighten minor bends carefully.
• Compressor mounts: If accessible, inspect the rubber mounts under the compressor. Replace worn Poolex compressor mounting rubbers if the compressor is touching the base.
• Secure piping: Ensure refrigerant and water pipes are not vibrating against the cabinet; add foam or clips as needed.