Trane RTAC Fault Code ED
Trane RTAC Fault Code ED is a warning alarm indicating: Evaporator Water Flow Lost. The most common causes include Chilled water pump stopped or failed. Estimated repair time: 1-2 hours. This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
Evaporator Water Flow Lost
Brand: Trane | Model: RTAC (Screw Compressor Chiller) | Code: ED | Severity: Warning
Observable Symptoms
- Water flow indicator shows zero or low flow
- Differential pressure across evaporator or condenser is low
- Pump may not be running or making abnormal noise
What to Check First
Before diving into detailed diagnostics, start with this quick first check:
Probable Causes
- Chilled water pump stopped or failed
- Flow switch malfunction
- Strainer clogged in water line
- Air in chilled water system
Recommended Inspection Steps
- Verify chilled water pump is running
- Check flow switch operation and setting
- Clean Y-strainer in water line
- Bleed air from system
- Replace flow switch if faulty
Required Tools & Equipment
- Coil cleaning brush and coil cleaner
- Safety PPE (gloves, safety glasses, face shield)
Estimated Repair Time
1-2 hours
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 ED mean?
Fault code ED on a Trane RTAC chiller indicates: Evaporator Water Flow Lost. This is a warning alarm that requires diagnostic attention.
What causes Trane RTAC alarm code ED?
Common causes include: Chilled water pump stopped or failed; Flow switch malfunction; Strainer clogged in water line
How do I fix Trane RTAC error code ED?
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.