Also applies to:SUN-120K-G01P3-EU-BM8SUN-125K-G01P3-EU-BM8SUN-130K-G01P3-EU-BM8SUN-135K-G01P3-EU-BM8SUN-136K-G01P3-EU-BM8
What it means
The DC busbar is unbalanced — The voltages on the two halves of the DC bus are unbalanced.
Cause: The DC bus half-voltages are unbalanced; the 'BUSN' cable or the driver-board power supply cable may be loose.
How to fix it
- 1Check whether the 'BUSN' cable or the driver-board power supply cable is loose
- 2Restart the inverter; if the fault still exists, contact your installer or Deye service.
Source: sun-120k-g01p3-eu-bm8-sun-125k-g01p3-eu-bm8-sun-130k-g01p3-eu-bm8-manual.pdf, p.62
Also applies to:SUN-7K-G02P1-EU-AM2SUN-7.5K-G02P1-EU-AM2SUN-8K-G02P1-EU-AM2SUN-9K-G02P1-EU-AM2SUN-10K-G02P1-EU-AM2SUN-10.5K-G02P1-EU-AM2
What it means
The DC busbar is unbalanced — The voltages on the two halves of the DC bus are unbalanced. The manual notes this code has hardly ever appeared in the field.
Cause: The voltages on the two halves of the DC bus drifted apart beyond the allowed unbalance.
How to fix it
Restart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.
Source: sun-7k-g02p1-eu-am2-sun-7-5k-g02p1-eu-am2-sun-8k-g02p1-eu-am2-manual.pdf, p.51 · sun-9k-g02p1-eu-am2-sun-10k-g02p1-eu-am2-sun-10-5k-g02p1-eu-am2-manual.pdf, p.51
Also applies to:SUN-60K-G03SUN-70K-G03SUN-75K-G03SUN-80K-G03SUN-90K-G03SUN-100K-G03SUN-110K-G03SUN-60K-G01P3-EU-AM8-LV+7
What it means
The DC busbar is unbalanced — The voltages on the two halves of the DC bus are unbalanced.
Cause: The DC bus half-voltages are unbalanced; the 'BUSN' cable or the driver-board power supply cable may be loose.
How to fix it
- 1Check whether the 'BUSN' cable or the driver-board power supply cable is loose
- 2Restart the inverter; if the fault still exists, contact your installer.
Source: sun-70k-g03-sun-75k-g03-sun-80k-g03-sun-90k-g03-sun-100k-g03-sun-110k-g03-manual.pdf, p.62 · sun-120k-g01p3-eu-am8-manual.pdf, p.61 · sun-60k-g01p3-eu-am8-lv-sun-70k-g01p3-eu-am8-lv-sun-75k-g01p3-eu-am8-lv-manual.pdf, p.61 · +1 more official manuals
Also applies to:SUN-6K-G06-LV-P1SUN-8K-G06-LV-P1SUN-6K-G06P3-EU-BM2-LV-P1SUN-8K-G06P3-EU-BM2-LV-P1SUN-10K-G05-LVSUN-12K-G05-LVSUN-15K-G05-LVSUN-15K-G06P3-EU-BM2-P1+48
What it means
The DC busbar is unbalanced — The two halves of the split DC bus are at unequal voltages.
Cause: The 'BUSN' cable or the driver-board power-supply cable is loose, unbalancing the split DC bus.
How to fix it
- 1Check whether the 'BUSN' cable or the driver-board power-supply cable is loose.
- 2Restart the inverter; if the fault still exists, contact your installer or Deye service.
Source: sun-6k-g06-lv-p1-manual.pdf, p.57 · sun-7k-g06p3-eu-bm2-sun-8k-g06p3-eu-bm2-sun-9k-g06p3-eubm2-sun-10k-g06p3-eu-bm2-sun-12k-g06p3-eu-bm2-manual.pdf, p.57
Also applies to:SUN-1K-G04P1-EU-AM1SUN-1.5K-G04P1-EU-AM1SUN-2K-G04P1-EU-AM1SUN-2.2K-G04P1-EU-AM1SUN-2.5K-G04P1-EU-AM1SUN-2.7K-G04P1-EU-AM1SUN-3K-G04P1-EU-AM1SUN-3.3K-G04P1-EU-AM1+15
What it means
The DC busbar is unbalanced — The two halves of the split DC bus are at unequal voltages.
Cause: The voltages of the two halves of the split DC bus became unequal.
How to fix it
Deye states this code has hardly ever appeared in the field; contact your installer or Deye service if it occurs.
Source: sun-2-7k-g04p1-eu-am1-sun-3k-g04p1-eu-am1-sun-3-3k-g04p1-eu-am1-sun-3-6k-g04p1-eu-am1-sun-4k-g04p1-eu-am1-manual.pdf, p.53
Also applies to:SUN-3.6K-SG05LP1-EU-SM2-PSUN-5K-SG05LP1-EU-SM2-PSUN-6K-SG05LP1-EU-SM2-PSUN-7K-SG05LP1-EU-SM2-PSUN-7.6K-SG05LP1-EU-SM2-PSUN-8K-SG05LP1-EU-SM2-PSUN-10K-SG05LP1-EU-SM2-PSUN-7.6K-SG01LP1-EU+21
What it means
The DC busbar is unbalanced — The DC busbar voltage is unbalanced.
Cause: When the hybrid inverter runs in split-phase mode and the load on L1 differs greatly from the load on L2, it reports F26.
How to fix it
- 1Wait for a while and check whether it returns to normal.
- 2In split-phase mode, balance the loads on L1 and L2.
- 3Restart the system 2-3 times.
- 4Seek help from Deye if the inverter cannot go back to the normal state.
Source: sun-3.6-5-6-7-7.6-8-10k-sg05lp1-eu-sm2-p-20260428-en-manual.pdf, p.50 · sun-12-14-16k-sg01lp1-eu-20260519-en-manual.pdf, p.46 · sun-3.6-6-k-og01lp1-eu-am2-20260406-en-manual.pdf, p.45 · +4 more official manuals
Also applies to:SUN-5K-SG01HP3-EU-AM2SUN-6K-SG01HP3-EU-AM2SUN-8K-SG01HP3-EU-AM2SUN-10K-SG01HP3-EU-AM2SUN-12K-SG01HP3-EU-AM2SUN-15K-SG01HP3-EU-AM2SUN-20K-SG01HP3-EU-AM2SUN-25K-SG01HP3-EU-AM2+9
What it means
BUS Unbalance Fault — BusUnbalance_Fault - the internal DC BUS voltages are unbalanced.
Cause: The load power on the 3 phases differs greatly, or there is DC leakage current.
How to fix it
- 1Wait for a while and check whether it returns to normal
- 2Restart the system 2~3 times.
Source: sun-12k-sg01hp3-eu-am2-manual.pdf, p.50 · sun-29.9-30-35-40-50k-sg01hp3-eu-bm3-4-20260224-en-manual.pdf, p.51 · sun-60-70-75-80k-sg02hp3-eu-em6-20260224-en-manual.pdf, p.51
Also applies to:SUN-5K-SG02LP2-US-AM2SUN-6K-SG02LP2-US-AM2SUN-7.6K-SG02LP2-US-AM2SUN-8K-SG02LP2-US-AM2SUN-10K-SG02LP2-US-AM3SUN-12K-SG02LP2-US-AM3
What it means
DC Busbar Unbalanced — The DC busbar is unbalanced - the internal DC BUS voltages are unbalanced.
Cause: When the hybrid inverter runs in split-phase mode and the load on L1 differs greatly from the load on L2, F26 is reported.
How to fix it
- 1Wait for a while and check whether it returns to normal
- 2Restart the system 2~3 times
- 3Seek help from us if it cannot go back to the normal state.
Source: sun-5k-sg02lp2-us-am2-sun-10k-sg02lp2-us-am3-sun-12k-sg02lp2-us-am3-manual.pdf, p.54
Also applies to:SUN-5K-SG04LP3-EUSUN-6K-SG04LP3-EUSUN-8K-SG04LP3-EUSUN-10K-SG04LP3-EUSUN-12K-SG04LP3-EUSUN-3K-SG05LP3-EU-SM2SUN-4K-SG05LP3-EU-SM2SUN-5K-SG05LP3-EU-SM2+9
What it means
DC Busbar Unbalanced — The DC busbar is unbalanced - the internal DC BUS voltages are unbalanced.
Cause: The load power of the 3 phases is very different, or there is DC leakage current.
How to fix it
- 1Wait for a while and check whether it returns to normal
- 2Restart the system 2~3 times
- 3Seek help from us if it cannot go back to the normal state.
Source: sun-5-6-8-10-12k-sg04lp3-eu-20260319-en-manual.pdf, p.47 · sun-3-4-5-6-8-10-12k-sg05lp3-eu-sm2-20260319-en-manual.pdf, p.47 · sun-14-15-16-18-20k-sg05lp3-eu-sm2-20260319-en-manual.pdf, p.47
Energy storage systemFault Also applies to:AI-W5.1-5P3-EU-B-ESSAI-W5.1-6P3-EU-B-ESSAI-W5.1-8P3-EU-B-ESSAI-W5.1-10P3-EU-B-ESSAI-W5.1-12P3-EU-B-ESS
What it means
The DC busbar is unbalanced
Cause: Large load-power differences between the three phases, or DC leakage current, unbalanced the internal DC bus.
How to fix it
- 1Wait a while and check whether it returns to normal; balance the loads across phases and restart the system 2-3 times.
- 2Seek help from Deye if it persists.
Source: ai-w5-1-b-datasheet.pdf, p.47
Energy storage systemFault Also applies to:GB-SL5K-EUGB-SL6K-EUGB-SL8K-EUGB-SL10K-EUGB-SL12K-EUGB-SL15K-EUGB-SL20K-EUGB-SL Pro 5K-EU+6
What it means
BusUnbalance_Fault — The DC busbar is unbalanced.
Cause: Large load-power differences between the three phases, or DC leakage current, unbalanced the internal DC bus.
How to fix it
- 1Wait a while and check whether it returns to normal; balance the loads across phases and restart the system 2-3 times.
- 2Seek help from Deye if it persists.
Source: gb-s12k-eu-gb-s15k-eugb-s20k-eu-gb-s15k-eu-gb-s20k-eu-manual.pdf, p.50 · gb-s5k-eu-gb-s20k-eu-datasheet.pdf, p.45
Also applies to:RW-L2.5ARW-L5.1RW-L10.2RW-F16SE-F5SE-F5 PlusSE-F5 ProSE-F12+7
What it means
Cell voltage sampling fails — The cell-voltage sampling circuit returned invalid readings.
Cause: A fault in the voltage-sampling harness or measurement circuit inside the pack made cell-voltage readings invalid.
How to fix it
- 1Restart the battery.
- 2If the code persists, the pack needs internal service - contact Deye support.
Source: deye-rw-l2.5a-user-manual-en.pdf, p.10 · rw-f16-manual.pdf, p.10 · rw-l10-2-manual.pdf, p.10 · +6 more official manuals
Also applies to:GB-A
What it means
ALARM_ID_FUSE_BLOWN — Blown fuse.
Cause: The main pack fuse opened - an external short circuit or an extreme over-current event.
How to fix it
Take the battery out of service and contact Deye support; the cause of the over-current must be found and cleared before the fuse is replaced.
Source: gb-a-pack6-gb-a4-gb-a10-gb-a16-manual.pdf, p.13