Daikin AGZ Fault Code E20
Daikin AGZ Fault Code E20 is a warning alarm indicating: Condenser coil temperature high. The most common causes include Condenser coil fouled. 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 coil temperature high
Brand: Daikin | Model: AGZ (Modular Scroll Chiller) | Code: E20 | Severity: Warning
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
- Condenser coil fouled
- Insufficient airflow across condenser
- High ambient temperature
- Condenser fan speed too low
Recommended Inspection Steps
- Clean condenser coils
- Verify condenser fan operation
- Check ambient temperature
- Adjust fan speed if applicable
Required Tools & Equipment
- Coil cleaning brush and coil cleaner
- Infrared thermometer or calibrated temperature probe
- Oil level sight glass inspection tool
- Safety PPE (gloves, safety glasses, face shield)
- Wire tracing and continuity tester
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 Daikin service representative for warranty-covered repairs
Related Fault Codes
Other Daikin AGZ codes that may be related:
OEM Service Manual Reference
OEM Reference: Daikin AGZ Modular Scroll Chiller Service Manual. Available through Daikin Applied technical support.
Frequently Asked Questions
What does Daikin AGZ fault code E20 mean?
Fault code E20 on a Daikin AGZ chiller indicates: Condenser coil temperature high. This is a warning alarm that requires diagnostic attention.
What causes Daikin AGZ alarm code E20?
Common causes include: Condenser coil fouled; Insufficient airflow across condenser; High ambient temperature
How do I fix Daikin AGZ error code E20?
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 Daikin service representative.