Daikin WME Fault Code H2
Daikin WME Fault Code H2 is a warning alarm indicating: Low pressure switch. The most common causes include Suction pressure too low. Estimated repair time: 45-90 minutes. This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
Low pressure switch
Brand: Daikin | Model: WME (Water-Cooled Screw Chiller) | Code: H2 | Severity: Warning
Observable Symptoms
- Suction pressure gauge reads below normal operating range
- Compressor may short cycle or run continuously without cooling
- Frost may appear on suction line or evaporator
What to Check First
Before diving into detailed diagnostics, start with this quick first check:
Probable Causes
- Suction pressure too low
- Low refrigerant charge
- Expansion valve not feeding
Recommended Inspection Steps
- Check charge
- Verify expansion valve
- Test pressure switch
Required Tools & Equipment
- PT chart for refrigerant type
- Refrigerant manifold gauge set
- Safety PPE (gloves, safety glasses, face shield)
Estimated Repair Time
45-90 minutes
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 WME codes that may be related:
OEM Service Manual Reference
OEM Reference: Daikin WME Water-Cooled Screw Chiller Service Manual. Available through Daikin Applied technical support.
Frequently Asked Questions
What does Daikin WME fault code H2 mean?
Fault code H2 on a Daikin WME chiller indicates: Low pressure switch. This is a warning alarm that requires diagnostic attention.
What causes Daikin WME alarm code H2?
Common causes include: Suction pressure too low; Low refrigerant charge; Expansion valve not feeding
How do I fix Daikin WME error code H2?
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.