Trane RTHD Fault Code ED
Trane RTHD Fault Code ED is a warning alarm indicating: Evaporator Water Flow Lost. The most common causes include Chilled water pump failure. 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: RTHD (Helical Rotary 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 failure
- Flow switch fault
- Strainer clogged
- Air in system
Recommended Inspection Steps
- Verify pump operation
- Check flow switch
- Clean strainer
- Bleed air from system
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 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 ED mean?
Fault code ED on a Trane RTHD chiller indicates: Evaporator Water Flow Lost. This is a warning alarm that requires diagnostic attention.
What causes Trane RTHD alarm code ED?
Common causes include: Chilled water pump failure; Flow switch fault; Strainer clogged
How do I fix Trane RTHD 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.