McQuay WMC Fault Code E07
McQuay WMC Fault Code E07 is a warning alarm indicating: Evaporator water temperature low. The most common causes include Chilled water setpoint set too low. Estimated repair time: 30-60 minutes (requires sensor replacement and calibration verification). This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
Evaporator water temperature low
Brand: McQuay | Model: WMC (Water-Cooled Screw Chiller) | Code: E07 | 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
- Chilled water setpoint set too low
- Evaporator water flow too low
- Building load very low
- Temperature sensor reading incorrect
Recommended Inspection Steps
- Verify chilled water setpoint is appropriate
- Check evaporator water flow rate
- Calibrate or replace temperature sensor
- Raise setpoint or stage down compressors
Required Tools & Equipment
- Infrared thermometer or calibrated temperature probe
- Safety PPE (gloves, safety glasses, face shield)
Estimated Repair Time
30-60 minutes (requires sensor replacement and calibration verification)
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 McQuay service representative for warranty-covered repairs
Related Fault Codes
Other McQuay WMC codes that may be related:
OEM Service Manual Reference
OEM Reference: McQuay WMC Water-Cooled Screw Chiller Service Manual. Available through Daikin Applied (formerly McQuay) technical support.
Frequently Asked Questions
What does McQuay WMC fault code E07 mean?
Fault code E07 on a McQuay WMC chiller indicates: Evaporator water temperature low. This is a warning alarm that requires diagnostic attention.
What causes McQuay WMC alarm code E07?
Common causes include: Chilled water setpoint set too low; Evaporator water flow too low; Building load very low
How do I fix McQuay WMC error code E07?
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 McQuay service representative.