Also applies to:SUN-120K-G01P3-EU-BM8SUN-125K-G01P3-EU-BM8SUN-130K-G01P3-EU-BM8SUN-135K-G01P3-EU-BM8SUN-136K-G01P3-EU-BM8SUN-7K-G02P1-EU-AM2SUN-7.5K-G02P1-EU-AM2SUN-8K-G02P1-EU-AM2+18
What it means
AC lower frequency — The grid frequency is below the protection setting.
Cause: The measured grid frequency is below the configured protection limit.
How to fix it
Check the frequency protection setting.
Source: sun-120k-g01p3-eu-bm8-sun-125k-g01p3-eu-bm8-sun-130k-g01p3-eu-bm8-manual.pdf, p.63 · sun-7k-g02p1-eu-am2-sun-7-5k-g02p1-eu-am2-sun-8k-g02p1-eu-am2-manual.pdf, p.52 · sun-9k-g02p1-eu-am2-sun-10k-g02p1-eu-am2-sun-10-5k-g02p1-eu-am2-manual.pdf, p.52 · +4 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+71
What it means
AC lower frequency — The grid frequency is below the protection setting.
Cause: Grid frequency measured below the configured under-frequency protection limit.
How to fix it
Check the frequency protection setting.
Source: sun-6k-g06-lv-p1-manual.pdf, p.58 · 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.54 · 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.58
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
AC lower frequency — Grid frequency out of range: the AC frequency is too low.
Cause: The grid frequency is below the range in the specification, or the AC cables are not firmly and correctly connected.
How to fix it
- 1Check that the frequency is in the range of the specification and that the AC cables are firmly and correctly connected.
- 2Seek 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.46 · +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
Grid Underfrequency — AC_UnderFreq_Fault - grid frequency out of range (too low).
Cause: The grid frequency is below the range given in the specification.
How to fix it
- 1Check whether the frequency is in the range of the specification
- 2Check whether the AC cables are firmly and correctly connected.
Source: sun-12k-sg01hp3-eu-am2-manual.pdf, p.51 · sun-29.9-30-35-40-50k-sg01hp3-eu-bm3-4-20260224-en-manual.pdf, p.52 · sun-60-70-75-80k-sg02hp3-eu-em6-20260224-en-manual.pdf, p.52
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-AM3SUN-5K-SG04LP3-EUSUN-6K-SG04LP3-EU+15
What it means
AC Underfrequency — AC lower frequency - grid frequency out of range (too low).
Cause: The grid frequency is below the range given in the specification.
How to fix it
- 1Check whether the frequency is in the range of the specification
- 2Check whether the AC cables are firmly and correctly connected
- 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.55 · 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 · +1 more official manuals
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
AC lower frequency — Grid frequency out of range (too low).
Cause: The grid frequency is below the range configured in the specification, or the AC cables are loose/incorrectly connected.
How to fix it
- 1Check that the grid frequency is within the specified range and that the AC cables are firmly and correctly connected.
- 2Seek help from Deye if it does not recover.
Source: ai-w5-1-b-datasheet.pdf, p.48
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
AC_UnderFreq_Fault — Grid frequency out of range (too low).
Cause: The grid frequency is below the range configured in the specification, or the AC cables are loose/incorrectly connected.
How to fix it
- 1Check that the grid frequency is within the specified range and that the AC cables are firmly and correctly connected.
- 2Seek help from Deye if it does not recover.
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
Heat error — The heating function failed.
Cause: The heating film did not warm the cells as commanded or the heating circuit reported an abnormal state - a fault in the heater or its control circuit.
How to fix it
- 1Restart the battery.
- 2If heating still fails in cold conditions, 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_BMU_COMM_ERROR — The BMU communication is faulty.
Cause: The internal bus between the BMS and one or more battery modules (BMUs) dropped - module wiring or a module board fault.
How to fix it
- 1Check the inter-module communication cabling and restart the system.
- 2If the fault persists, contact Deye support.
Source: gb-a-pack6-gb-a4-gb-a10-gb-a16-manual.pdf, p.14