Payne Refrigerant Flow Noise / Possible Leak

Payne air conditioner occasionally emits a hissing sound near the indoor coil or line set.

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.

Possible Causes

Normal expansion noise at TXV or piston, Small refrigerant leak at flare or braze joint, High refrigerant velocity due to sizing

Safety: Do not attempt to tighten refrigerant fittings under pressure.

1. Identify location: Use a tube or hose as a stethoscope to localize the sound to the TXV, distributor, or a joint.
2. Look for oil stains: Oil around a joint or valve suggests a leak.
3. Monitor performance: If cooling is normal and no oil is visible, some hissing at the metering device can be normal.
4. If performance declines or ice forms: Call a technician to perform a leak search and repair.

Hard 4/5

Thermostatic Expansion Valve (TXV)

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