What causes Daikin Mini Split E2?

An earth (ground) fault: a component whose wiring insulation has broken down and is leaking current to ground. Daikin's flowchart checks the compressor first, then other parts. Defective compressor motor insulation, which Daikin says is fixed by replacing the compressor. Insulation breakdown in other high-voltage parts: Daikin's VRV IV+ manual says to megger-test the solenoid valve coils, 4-way valve coil and fan motors as well as the compressor. Temporary liquid back or refrigerant stagnating in the compressor, for example after a long shutdown or power outage; Daikin lists this as a supposed cause that can clear on its own. Wrong or damaged wiring at the current sensor (T1A), or a faulty current sensor. Power supply problems: a disturbed or unbalanced supply, a power drop or a short circuit (ESIE18-14). Refrigerant overcharge or moisture in the refrigerant circuit (ESIE18-14 checks 5 and 6). For E2-06, E2-07 or E2-08 only: connector X101A unplugged, a broken wire, or a defective outdoor unit main PCB (A1P).

How do I fix Daikin Mini Split E2?

Note the full code including the sub-code (for example E2-01 or E2-06) from the remote controller or the outdoor unit display; it tells your technician which outdoor unit tripped and whether it's a real leak or a detection circuit fault. Check whether the unit sat off for a long time or came back from a power outage. Daikin says E2 can be caused by temporary refrigerant stagnation in the compressor and may clear after a restart. Turn the system off, switch off power at the breaker or disconnect, wait a few minutes, restore power and reset once from the controller. Look around the outdoor unit for obvious damage: chewed or crushed power wiring, water pooled inside the cabinet, or burn marks. Don't open the electrical box yourself. If E2 comes back after one reset, leave the system off and call a licensed HVAC or VRV technician. Repeated resets on a ground fault are unsafe.

When should I call a pro for Daikin Mini Split E2?

Following Daikin's SiUS341615E flowchart for E2-01 to -03: power off, disconnect the compressor lead wires, confirm the current sensor (T1A) is wired correctly, then insulation-test the compressor (replace it if insulation is defective; on dual-compressor models check M1C and M2C) and then other parts. If nothing shows defective insulation, reconnecting the wires and powering up; Daikin says the unit can keep operating if it runs normally, since the trip was likely temporary oil return or refrigerant residue. Per ESIE18-14, checking the current sensor: confirming pins 1 and 4 on connector X101A are bridged, checking the wiring from pins 2 and 3 to the sensor, and measuring 45 to 50 ohms between pins 2 and 3 (replace the sensor if not). Confirming the power supply meets Daikin's requirements (no imbalance, power drop or short circuit), then checking the main PCB, refrigerant charge and moisture in the circuit, in that order. For E2-06 to -08: identifying the unit from monitor mode (E02-06 master, -07 slave 1, -08 slave 2), making sure X101A is properly connected, and replacing the outdoor unit main PCB (A1P) if it is and the error remains. If the error clears on reset, Daikin attributes it to external factors such as electrical noise.

Code: E2🔧 Daikin Mini Split

Daikin Error Code E2 (E2-01, E2-02, E2-06): Ground Leakage Detected (Meaning, Causes, Fixes)

Q: What does Daikin Mini Split E2 mean?

E2 on a Daikin VRV outdoor unit means the outdoor unit's main board detected electrical current leaking to ground (an earth fault), or that the ground leakage detection circuit itself is open. The unit stops and needs a manual reset. Sub-codes E2-01, E2-02 and E2-03 are a ground leakage trip on the main, first or second outdoor unit; E2-06, E2-07 and E2-08 mean the leakage detection core or its connector is missing. Because this is an electrical fault, reset once and call a licensed HVAC technician if it comes back. In Daikin's US VRV IV heat pump service manual SiUS341615E, E2 is "Current Leakage Detection": current leakage is detected in the earth leakage detection circuit, and the error is set on the outdoor unit main PCB. The error code list breaks it down as E2-01, E2-02 and E2-03, "Ground leakage detection error" on the master unit, slave unit 1 and slave unit 2, and E2-06, E2-07 and E2-08, "Missing of ground leakage detection core" on the same three units. Daikin's European VRV IV+ service manual ESIE18-14 says the main PCB triggers E2-01/02/03 when it detects earth leakage through the current sensor (T1A) above the safety value, listed in its safety device table as more than 75 mA (plus or minus 25%). In both cases the unit stops operating and has to be reset manually from the user interface. The main/sub numbering only matters on systems with more than one outdoor unit; the main unit is the one the F1-F2 IN transmission line connects to. E2 isn't in the error tables for Daikin's Entra wall-mount mini splits or its SkyAir light-commercial manual, so if you see E2 on one of those, check your own model's manual.

Reviewed 2026-10-24 · Based on 3 manufacturer & service sources

What the code means

In Daikin's US VRV IV heat pump service manual SiUS341615E, E2 is "Current Leakage Detection": current leakage is detected in the earth leakage detection circuit, and the error is set on the outdoor unit main PCB. The error code list breaks it down as E2-01, E2-02 and E2-03, "Ground leakage detection error" on the master unit, slave unit 1 and slave unit 2, and E2-06, E2-07 and E2-08, "Missing of ground leakage detection core" on the same three units. Daikin's European VRV IV+ service manual ESIE18-14 says the main PCB triggers E2-01/02/03 when it detects earth leakage through the current sensor (T1A) above the safety value, listed in its safety device table as more than 75 mA (plus or minus 25%). In both cases the unit stops operating and has to be reset manually from the user interface. The main/sub numbering only matters on systems with more than one outdoor unit; the main unit is the one the F1-F2 IN transmission line connects to. E2 isn't in the error tables for Daikin's Entra wall-mount mini splits or its SkyAir light-commercial manual, so if you see E2 on one of those, check your own model's manual.

Likely causes

An earth (ground) fault: a component whose wiring insulation has broken down and is leaking current to ground. Daikin's flowchart checks the compressor first, then other parts.
Defective compressor motor insulation, which Daikin says is fixed by replacing the compressor.
Insulation breakdown in other high-voltage parts: Daikin's VRV IV+ manual says to megger-test the solenoid valve coils, 4-way valve coil and fan motors as well as the compressor.
Temporary liquid back or refrigerant stagnating in the compressor, for example after a long shutdown or power outage; Daikin lists this as a supposed cause that can clear on its own.
Wrong or damaged wiring at the current sensor (T1A), or a faulty current sensor.
Power supply problems: a disturbed or unbalanced supply, a power drop or a short circuit (ESIE18-14).
Refrigerant overcharge or moisture in the refrigerant circuit (ESIE18-14 checks 5 and 6).
For E2-06, E2-07 or E2-08 only: connector X101A unplugged, a broken wire, or a defective outdoor unit main PCB (A1P).

Safe DIY checks

⚠ Before you start

E2 means current may be leaking to ground, so treat the outdoor unit as an electrical hazard: turn off the power at the breaker or disconnect before touching anything, and leave panels closed. VRV outdoor units run on high-voltage power and the inverter boards can hold a charge after power is removed. Insulation (megger) testing, compressor replacement and any refrigerant work must be done by a qualified technician; in the US, handling refrigerant requires EPA Section 608 certification.

Note the full code including the sub-code (for example E2-01 or E2-06) from the remote controller or the outdoor unit display; it tells your technician which outdoor unit tripped and whether it's a real leak or a detection circuit fault.
Check whether the unit sat off for a long time or came back from a power outage. Daikin says E2 can be caused by temporary refrigerant stagnation in the compressor and may clear after a restart.
Turn the system off, switch off power at the breaker or disconnect, wait a few minutes, restore power and reset once from the controller.
Look around the outdoor unit for obvious damage: chewed or crushed power wiring, water pooled inside the cabinet, or burn marks. Don't open the electrical box yourself.
If E2 comes back after one reset, leave the system off and call a licensed HVAC or VRV technician. Repeated resets on a ground fault are unsafe.

🛠 When to call a pro

Following Daikin's SiUS341615E flowchart for E2-01 to -03: power off, disconnect the compressor lead wires, confirm the current sensor (T1A) is wired correctly, then insulation-test the compressor (replace it if insulation is defective; on dual-compressor models check M1C and M2C) and then other parts.
If nothing shows defective insulation, reconnecting the wires and powering up; Daikin says the unit can keep operating if it runs normally, since the trip was likely temporary oil return or refrigerant residue.
Per ESIE18-14, checking the current sensor: confirming pins 1 and 4 on connector X101A are bridged, checking the wiring from pins 2 and 3 to the sensor, and measuring 45 to 50 ohms between pins 2 and 3 (replace the sensor if not).
Confirming the power supply meets Daikin's requirements (no imbalance, power drop or short circuit), then checking the main PCB, refrigerant charge and moisture in the circuit, in that order.
For E2-06 to -08: identifying the unit from monitor mode (E02-06 master, -07 slave 1, -08 slave 2), making sure X101A is properly connected, and replacing the outdoor unit main PCB (A1P) if it is and the error remains. If the error clears on reset, Daikin attributes it to external factors such as electrical noise.

Parts that commonly fix it

Always match the part number to your exact model.

⚙

Insulation resistance tester (megohmmeter)

What Daikin's manuals use to find the part leaking to ground (compressor, fan motors, valve coils). For techs; a regular multimeter won't show insulation breakdown reliably.

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⚙

Digital multimeter

For checking the current sensor resistance (45 to 50 ohms across X101A pins 2 and 3) and wiring continuity.

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⚙

Outdoor unit main PCB (A1P)

Daikin's fix for E2-06 to -08 when X101A is connected and the error remains; match it to your exact outdoor unit model.

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Sources

Last reviewed 2026-10-24. Always confirm against the manual for your exact model number.

Daikin Error Code E2 (E2-01, E2-02, E2-06): Ground Leakage Detected (Meaning, Causes, Fixes)

What the code means

Likely causes

Safe DIY checks

🛠 When to call a pro

Parts that commonly fix it

Insulation resistance tester (megohmmeter)

Digital multimeter

Outdoor unit main PCB (A1P)

Related codes

Sources