Trane RTHD Fault Code C6
Trane RTHD Fault Code C6 is a warning alarm indicating: Low Chilled Water Temp: Unit On. The most common causes include Low flow during operation. Estimated repair time: 45-90 minutes. This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
Low Chilled Water Temp: Unit On
Brand: Trane | Model: RTHD (Helical Rotary Chiller) | Code: C6 | Severity: Warning
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
- Low flow during operation
- Expansion valve overfeeding
- Sensor drift
Recommended Inspection Steps
- Verify flow rate
- Check expansion valve
- Compare sensor to thermometer
Required Tools & Equipment
- Digital multimeter
- OEM service manual
- Safety PPE (gloves, safety glasses)
- Safety PPE (gloves, safety glasses, face shield)
Estimated Repair Time
45-90 minutes
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 RTHD codes that may be related:
OEM Service Manual Reference
OEM Reference: Trane RTHD Water-Cooled Helical Rotary Chiller Service Manual (SVR-SVN002-EN). Trane CH530 Controls manual also required.
Frequently Asked Questions
What does Trane RTHD fault code C6 mean?
Fault code C6 on a Trane RTHD chiller indicates: Low Chilled Water Temp: Unit On. This is a warning alarm that requires diagnostic attention.
What causes Trane RTHD alarm code C6?
Common causes include: Low flow during operation; Expansion valve overfeeding; Sensor drift
How do I fix Trane RTHD error code C6?
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.