Trane RTAC Fault Code 1C6
Trane RTAC Fault Code 1C6 is a critical safety alarm indicating: High Differential Refrigerant Pressure - Circuit 1. The most common causes include Condenser water temperature too high. Estimated repair time: 2-4 hours (requires leak repair, evacuation, and refrigerant recharge). This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
High Differential Refrigerant Pressure - Circuit 1
Brand: Trane | Model: RTAC (Screw Compressor Chiller) | Code: 1C6 | Severity: Critical
Observable Symptoms
- Controller displays alarm code and description
- Chiller may be locked out or running in degraded mode
- Alarm indicator light is illuminated on control panel
What to Check First
Before diving into detailed diagnostics, start with this quick first check:
Probable Causes
- Condenser water temperature too high
- Non-condensables in system
- Refrigerant overcharge
- Condenser water flow too low
Recommended Inspection Steps
- Check condenser water temperature and flow
- Vent non-condensables from high side
- Verify refrigerant charge amount
- Clean condenser tubes if fouled
Required Tools & Equipment
- Coil cleaning brush and coil cleaner
- Infrared thermometer or calibrated temperature probe
- PT chart for refrigerant type
- Safety PPE (gloves, safety glasses, face shield)
Estimated Repair Time
2-4 hours (requires leak repair, evacuation, and refrigerant recharge)
When to Call a Professional
- If the fault persists after completing all recommended inspection steps
- If you observe unusual noises, vibrations, or oil leaks from the compressor
- If refrigerant charge levels are outside OEM specifications and EPA-certified recovery is needed
- If electrical measurements show voltage imbalance greater than 2% between phases
- If the fault recurs immediately after reset, indicating an unresolved safety condition
- Contact an authorized Trane service representative for warranty-covered repairs
Related Fault Codes
Other Trane RTAC codes that may be related:
OEM Service Manual Reference
OEM Reference: Trane RTAC Air-Cooled Rotary Screw Chiller Service Manual (SVR-SVN001-EN). Available through Trane Commercial support.
Frequently Asked Questions
What does Trane RTAC fault code 1C6 mean?
Fault code 1C6 on a Trane RTAC chiller indicates: High Differential Refrigerant Pressure - Circuit 1. This is a critical safety alarm that requires diagnostic attention.
What causes Trane RTAC alarm code 1C6?
Common causes include: Condenser water temperature too high; Non-condensables in system; Refrigerant overcharge
How do I fix Trane RTAC error code 1C6?
Follow the recommended inspection steps below. Start with the quick check, then proceed through each step. If the fault persists after all steps, contact an authorized Trane service representative.