Error Code: EL 0C – System Lacks Refrigerant

Error Code: EL 0C – System Lacks Refrigerant

What this means:
The system has detected insufficient refrigerant. This may be due to installation issues, improper valve positions, excessive pipe length, or refrigerant leakage.

Common causes include:

• Outdoor unit valves are not fully open (not releasing pre-charged refrigerant).

• Piping length exceeds the precharged limit (typically 25 ft per zone).

• Leakage at fittings or connections, especially after new installation.

How to identify a leak:

• Look for oil residue around joints or fittings.

• Listen for hissing or bubbling sounds.

• Apply soapy water to the tubing and watch for bubbles.

• Use leak detectors or nitrogen pressure testing for confirmation.

Try this first (quick reset):

1. Power off the system.

2. Wait at least 15 minutes.

3. Turn it back on and check operation.

Next steps (for technicians):

1. Feel airflow at the indoor unit:

   • If no cool or warm air is present → proceed with leak inspection.

2. Check for system leakage:

   • If found → repair and recharge with refrigerant.

3. Check sensors:

   • Is T2 sensor loose? → secure it.

   • Is T1 sensor too close to the evaporator? → reposition it.

4. If sensors are correctly installed and no leak exists:

   • Recharge the refrigerant (approx. 10% of the nameplate charge).

5. If error still remains after all checks:

   • Replace the indoor PCB.

What you might need:

• Additional refrigerant

• Leak detection tools

• Indoor PCB

• Soapy water or electronic leak tester

Helpful tip:
This is one of the most common errors on a new install. Always verify valve position and piping length before diagnosing deeper issues.

Click here to view the detailed guide.ELOC