What does Error Code E4 mean on a Daikin AC?

Error Code E4 on a Daikin Air Conditioner indicates 'Low Pressure Abnormality'. This is almost always caused by a lack of refrigerant (Gas Leak) or a blockage in the copper piping.

Can I just top up the gas for E4 error?

No. Daikin Inverter ACs (R32/R410A) require a full vacuum and refill by weight. Simply topping up gas often leads to poor cooling or compressor failure. You must find and fix the leak first.

How much does it cost to fix Daikin E4 error?

Repairing an E4 error involves leak testing, brazing, and gas charging. Costs typically range from ₹2,500 to ₹4,500 depending on the gas type and leak severity.

Daikin AC Error Code E4 | Low Pressure & Gas Leak | Atlas Aircon

Low Pressure / Leakage

Daikin Error E4

Refrigerant Starvation.
System Halted to Protect Compressor from Burnout.

Symptom

No Cooling

Sign

Ice on Pipes

Fix

Gas Refill Req.

The “Empty Tank” Problem

The E4 Error is your Daikin AC’s way of saying it’s trying to pump gas but finding none. The Low Pressure Switch (LPS) detects that the refrigerant pressure has dropped below the safe operating limit.

Why it stops: Refrigerant gas also cools the compressor motor and carries oil. Running the compressor without gas (vacuum mode) will cause it to overheat and seize up permanently. E4 is a safety cutoff.

1 DIY Checks (Confirming the Leak)

Ice Formation

Check the outdoor unit valves (where pipes connect). If you see white ice on the thinner pipe (Discharge line), your gas pressure is low.

Oily Spots

Inspect the copper piping joints. Refrigerant oil escapes with the gas. Dark, oily patches on nuts or U-bends confirm a leak location.

Air Flow but No Cooling

The outdoor fan is running, the compressor is vibrating, but the air coming from the indoor unit is room temperature.

Atlas Aircon Repair Protocol

Strict Standard for Gas Leaks:

01.
Nitrogen Pressure Testing We don’t guess. We fill the system with 350 PSI of Nitrogen to find the exact pin-hole leak in the condenser or evaporator.
02.
Brazing & Vacuuming After welding the leak, we use a high-vacuum pump to remove moisture. Moisture + R32 Gas = Acid, which kills compressors. Vacuum is mandatory.
03.
Gas Charging by Weight Daikin Inverters need precise charging (e.g., 850g). We use a digital scale, not just pressure gauges, for 100% cooling efficiency.

Estimated Repair Cost (Atlas Aircon)

Leak Test: ₹500 – ₹800

Full Gas Refill: ₹2,400+

Frequently Asked Questions

Why did my new AC leak gas so soon?

This is usually due to poor installation quality. If the flare nuts connecting the pipes weren’t tightened with a torque wrench, or if vibrations loosened a joint, gas can escape within months.

Is E4 caused by dirty filters?

Rarely. Dirty filters usually cause “High Pressure” or freezing, but E4 is specifically “Low Pressure.” However, extremely choked filters can drop suction pressure enough to confuse the sensor, so cleaning them is a good first step.

Can I top up R32 gas?

Not Recommended. R32 and R410A are blends. If you lose 50% gas, the chemical composition of the remaining gas changes. Topping up results in poor efficiency. It is better to vent the remaining gas, vacuum, and refill fresh gas.

ATLAS AIRCON

Daikin AC Error Code E4