Tempstar Loss of Refrigerant Charge / Flow Restriction

Tempstar air conditioner outdoor unit runs but indoor coil is not cold, lines are warm

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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

Refrigerant leak, Blocked or stuck TXV (thermostatic expansion valve), Restricted filter-drier, Incorrectly sized or kinked line set

How to Fix / Troubleshooting

Safety first: Do not attempt to connect gauges or add refrigerant yourself.

Steps:

  • 1. Check airflow: Ensure indoor filter is clean and blower is running properly.
  • 2. Feel lines (briefly): With system running, the larger suction line should normally be cool to cold and sweating; if both lines are warm, there may be a charge or restriction issue.
  • 3. Look for oil stains: Inspect line set and coil connections for oily spots indicating leaks.
  • 4. Call a technician: A Tempstar-qualified tech must locate leaks, repair, evacuate, and recharge the system.
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Repair Difficulty

Professional Required 5/5

Required Part

Thermostatic Expansion Valve (TXV)
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