H4

Daikin H4 Error Code – Malfunction of Low Pressure Switch (LPS)

Air Conditioner · HIGH Severity

HIGH severity Air Conditioner Model: Daikin Inverter 18000 BTU
What This Error Means
Defective low pressure switch, broken wire, defective outdoor unit PCB or connector contact
Diagnostic & Repair Steps
1
Record Error Code
Note the exact error code displayed: H4. Record when it appeared and any symptoms (unusual sounds, smells, performance issues). 🔧 Pen and paper
CHECK ~5 min
2
Power Reset
Turn off the appliance at the power switch and unplug from the wall socket. Wait 5 minutes for capacitors to discharge. Plug back in and restart. 🔧 None ⚠️ Wait full 5 minutes before restarting
RESET ~10 min
3
Visual Inspection
Inspect all visible components for signs of burning, melting, corrosion, or physical damage. Check all wiring connections for looseness. 🔧 Flashlight, screwdrivers ⚠️ Disconnect power before opening unit covers
INSPECT ~15 min
4
Check Component Connections
Based on error "Malfunction of Low Pressure Switch (LPS)", identify and check all related component connectors and wiring harnesses for secure connection. 🔧 Multimeter, screwdrivers
CHECK ~20 min
5
Contact Technical Support
If error persists after above steps, contact manufacturer technical support with model number, error code, and findings from inspection steps. 🔧 Phone or internet
CHECK ~5 min

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Related Daikin Error Codes
H0 Malfunction of Sensor System of Compressor H1 Malfunction of Room Temperature Sensor or Humidifier Unit Damper H3 Malfunction of High Pressure Switch (HPS)