McQuay WMC Fault Code E14
McQuay WMC Fault Code E14 is a warning alarm indicating: Expansion valve fault. The most common causes include Electronic expansion valve stepper motor failure. Estimated repair time: 1-2 hours. This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
Expansion valve fault
Brand: McQuay | Model: WMC (Water-Cooled Screw Chiller) | Code: E14 | 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
- Electronic expansion valve stepper motor failure
- Valve controller communication lost
- Valve mechanically stuck or frozen
- Valve wiring damaged
Recommended Inspection Steps
- Check expansion valve wiring connections
- Verify controller communication status
- Test valve stepping operation with service tool
- Inspect valve for mechanical sticking
- Replace expansion valve assembly if faulty
Required Tools & Equipment
- Safety PPE (gloves, safety glasses, face shield)
- Wire tracing and continuity tester
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 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 E14 mean?
Fault code E14 on a McQuay WMC chiller indicates: Expansion valve fault. This is a warning alarm that requires diagnostic attention.
What causes McQuay WMC alarm code E14?
Common causes include: Electronic expansion valve stepper motor failure; Valve controller communication lost; Valve mechanically stuck or frozen
How do I fix McQuay WMC error code E14?
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.