E4
Daikin E4 Error Code – Refrigerant Low Pressure
Air Conditioner · HIGH Severity
What This Error Means
Low pressure protection activated
Diagnostic & Repair Steps
1
Check Condenser Coils
Inspect outdoor unit condenser coils for dirt, debris, or blockage. Blocked coils cause high pressure buildup.
Inspect outdoor unit condenser coils for dirt, debris, or blockage. Blocked coils cause high pressure buildup.
INSPECT
~10 min
2
Clean Condenser
Use compressed air or low-pressure water to clean condenser fins. Ensure fins are straight and unblocked. ⚠️ Do not use high pressure water - will damage fins
Use compressed air or low-pressure water to clean condenser fins. Ensure fins are straight and unblocked. ⚠️ Do not use high pressure water - will damage fins
CLEAN
~20 min
3
Check Outdoor Fan
Verify outdoor fan is spinning freely and at correct speed. A slow or stuck fan causes poor heat rejection and high pressure.
Verify outdoor fan is spinning freely and at correct speed. A slow or stuck fan causes poor heat rejection and high pressure.
CHECK
~10 min
4
Check Refrigerant Charge
Connect manifold gauge set to service ports. High-side pressure should be within manufacturer spec. Overcharge also causes high pressure. ⚠️ Only certified technicians should handle refrigerant
Connect manifold gauge set to service ports. High-side pressure should be within manufacturer spec. Overcharge also causes high pressure. ⚠️ Only certified technicians should handle refrigerant
TEST
~20 min
5
Inspect High Pressure Switch
Locate and test the high pressure switch continuity with multimeter. Replace if faulty.
Locate and test the high pressure switch continuity with multimeter. Replace if faulty.
TEST
~15 min
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