How to Recognize a Failing Bundle Head Seal

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How to Recognize a Failing Bundle Head Seal

Health & Fitness


1. Visible Leaks

Look for moisture, stains, or dripping near the bundle head. Leaks often start small and grow over time.

2. Unusual Noises

Hissing or bubbling sounds can mean air or fluid is escaping through a faulty seal.

3. Pressure Loss

Monitor system pressure. A drop may indicate the seal is no longer holding properly.

4. Increased Energy Use

A failing seal can reduce system efficiency. Higher utility bills may reflect this change.

5. Temperature Changes

Air may feel warmer or cooler than expected if the seal is not controlling flow properly.

6. Odors Near the Unit

A damaged seal can let in dust, mold, or chemical smells from other parts of the system.

7. Corrosion Around the Seal

Rust or residue near the bundle head may show that moisture is escaping past the seal.

8. Loose or Misaligned Components

A failing seal can cause nearby parts to shift or loosen. Inspect for movement or gaps.