McQuay WMC Fault Code E24
McQuay WMC Fault Code E24 is a critical safety alarm indicating: Low oil differential pressure. The most common causes include Oil pump wear. Estimated repair time: 1-2 hours (requires oil addition or oil change, filter replacement). This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
Low oil differential pressure
Brand: McQuay | Model: WMC (Water-Cooled Screw Chiller) | Code: E24 | Severity: Critical
Observable Symptoms
- Oil sight glass shows low level or empty
- Compressor may make unusual noise from lack of lubrication
- Oil pressure differential alarm may also be active
What to Check First
Before diving into detailed diagnostics, start with this quick first check:
Probable Causes
- Oil pump wear
- Oil filter clogged
- Oil pressure regulating valve stuck
- Low oil level
Recommended Inspection Steps
- Check oil sight glass level
- Replace oil filter
- Measure oil pump pressure
- Inspect oil pressure regulator
- Add oil if level is low
Required Tools & Equipment
- Oil level sight glass inspection tool
- Safety PPE (gloves, safety glasses, face shield)
Estimated Repair Time
1-2 hours (requires oil addition or oil change, filter replacement)
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 E24 mean?
Fault code E24 on a McQuay WMC chiller indicates: Low oil differential pressure. This is a critical safety alarm that requires diagnostic attention.
What causes McQuay WMC alarm code E24?
Common causes include: Oil pump wear; Oil filter clogged; Oil pressure regulating valve stuck
How do I fix McQuay WMC error code E24?
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.