Day & Night Compressor Mounting or Internal Mechanical Issue

Outdoor unit vibrates excessively and is very noisy at startup

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Loose compressor mounting bolts, Deteriorated rubber isolation grommets, Internal compressor mechanical wear, Misaligned refrigerant piping causing resonance

How to Fix / Troubleshooting

Safety first: Turn OFF power at the outdoor disconnect before opening the cabinet.

  • Step 1 – Check compressor mounts: Inspect the compressor mounting bolts and rubber grommets. Tighten loose bolts and replace cracked grommets.
  • Step 2 – Secure piping: Ensure refrigerant lines are properly clamped and not touching the cabinet, which can amplify vibration.
  • Step 3 – Level the unit: Confirm the condenser is level on its pad. Shim if necessary.
  • Professional evaluation: If noise persists, the compressor may be failing internally and should be evaluated by a technician.
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Repair Difficulty

Medium 3/5

Required Part

Compressor Mounting Kit
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