McQuay MCS Fault Code E16
McQuay MCS Fault Code E16 is a warning alarm indicating: Condenser water temperature high. The most common causes include Cooling tower issue. Estimated repair time: 4-6 hours (requires isolating water circuit, mechanical or chemical tube cleaning). This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
Condenser water temperature high
Brand: McQuay | Model: MCS (Modular Chiller System) | Code: E16 | 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
- Cooling tower issue
- Condenser water flow low
- Condenser tubes fouled
Recommended Inspection Steps
- Check cooling tower
- Verify water flow
- Clean tubes
Required Tools & Equipment
- Coil cleaning brush and coil cleaner
- Infrared thermometer or calibrated temperature probe
- Safety PPE (gloves, safety glasses, face shield)
Estimated Repair Time
4-6 hours (requires isolating water circuit, mechanical or chemical tube cleaning)
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 MCS codes that may be related:
OEM Service Manual Reference
OEM Reference: McQuay MCS Modular Chiller Service Manual. Available through Daikin Applied technical support.
Frequently Asked Questions
What does McQuay MCS fault code E16 mean?
Fault code E16 on a McQuay MCS chiller indicates: Condenser water temperature high. This is a warning alarm that requires diagnostic attention.
What causes McQuay MCS alarm code E16?
Common causes include: Cooling tower issue; Condenser water flow low; Condenser tubes fouled
How do I fix McQuay MCS error code E16?
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.