Loud rattling or vibrating noise from the pool heater during operation.

Safety first: Turn off power before tightening any screws or touching internal components.

• Inspect exterior: Check all access panels, fan guard, and top cover for looseness. Tighten screws evenly.
• Level the base: Ensure the SPRSUN unit sits on a solid, level pad. Shim if necessary to eliminate rocking.
• Internal inspection: With power off and panels removed, look for copper refrigerant lines or wires touching metal surfaces. Gently reposition and secure with foam or clamps.
• Compressor mounts: Check that rubber compressor mounts are intact and bolts are snug but not overtightened.