64Fault

DEYE inverter error 64 (F64)

IGBT heat sink high temperature

Also displayed as F64 on some models.

Fault — the inverter cuts its output and the red LED stays solid until the fault is cleared.

The exact meaning depends on your model:

SUN G01P3-EU-BM8 Series

InverterFault

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+3

What it means

IGBT heat sink high temperature — The IGBT heat-sink temperature is too high.

Cause: The IGBT heat-sink temperature exceeded the limit - inadequate cooling or high ambient temperature, or a temperature sensor fault, unsuitable firmware, or a wrong model configuration producing a false reading.

How to fix it

  1. Check the temperature sensor; check that the firmware is suitable for the hardware and that the inverter is its right model
  2. Restart 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.64 · sun-7k-g02p1-eu-am2-sun-7-5k-g02p1-eu-am2-sun-8k-g02p1-eu-am2-manual.pdf, p.53 · sun-9k-g02p1-eu-am2-sun-10k-g02p1-eu-am2-sun-10-5k-g02p1-eu-am2-manual.pdf, p.53

SUN G03/G01P3-AM8 Series

InverterFault

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

IGBT heat sink high temperature — The IGBT heat-sink temperature is too high.

Cause: The IGBT heat-sink temperature exceeded the limit - inadequate cooling or high ambient temperature, or a temperature sensor fault, unsuitable firmware, or a wrong model configuration producing a false reading.

How to fix it

  1. Check the temperature sensor; check that the firmware is suitable for the hardware and that the inverter is its right model
  2. Restart the inverter; if the fault still exists, contact your installer.

Source: sun-120k-g01p3-eu-am8-manual.pdf, p.63 · sun-60k-g01p3-eu-am8-lv-sun-70k-g01p3-eu-am8-lv-sun-75k-g01p3-eu-am8-lv-manual.pdf, p.63 · sun-60k-g03-sun-70k-g03sun-75k-g03sun-80k-g03-sun-70k-g03-sun-75k-g03-sun-80k-g03-manual.pdf, p.63

SUN G04/G05/G06 3-Phase

InverterFault

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

IGBT heat sink high temperature — The IGBT heat-sink temperature exceeded its limit.

Cause: IGBT heat-sink over-temperature; it can also be a faulty temperature sensor, firmware not suitable for the hardware, or a wrong inverter model configuration.

How to fix it

  1. Check the temperature sensor; check that the firmware is suitable for the hardware and that the inverter is its right model.
  2. Restart the inverter; if the fault still exists, contact your installer or Deye service.

Source: sun-6k-g06-lv-p1-manual.pdf, p.59 · 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.55 · 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.59

SUN LP1 Hybrid Series

InverterFault

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

Heat sink high temperature failure — The heat sink temperature is too high.

Cause: The working environment temperature is too high, causing the inverter heat sink to overheat.

How to fix it

  1. Check whether the work environment temperature is too high.
  2. Turn off the inverter for 10 minutes and restart.
  3. Seek 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.51 · sun-12-14-16k-sg01lp1-eu-20260519-en-manual.pdf, p.47 · sun-3.6-6-k-og01lp1-eu-am2-20260406-en-manual.pdf, p.46 · +4 more official manuals

SUN SG01HP3/SG02HP3 Hybrid

InverterFault

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

Heat Sink Overtemperature — Heatsink_HighTemp_Fault - the heat sink temperature is too high.

Cause: The heat sink temperature exceeded the limit; the working environment temperature may be too high.

How to fix it

  1. Check whether the working environment temperature is too high
  2. Turn off the inverter for 10 minutes and restart.

Source: sun-12k-sg01hp3-eu-am2-manual.pdf, p.52 · sun-29.9-30-35-40-50k-sg01hp3-eu-bm3-4-20260224-en-manual.pdf, p.53 · sun-60-70-75-80k-sg02hp3-eu-em6-20260224-en-manual.pdf, p.53

SUN SG02LP2-US Hybrid

InverterFault

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

Heat Sink High Temperature — Heat sink high temperature failure - the heat sink temperature is too high.

Cause: The heat sink temperature exceeded the limit; the working environment temperature may be too high.

How to fix it

  1. Check whether the working environment temperature is too high
  2. Turn off the inverter for 10 minutes and restart
  3. Seek 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.48 · sun-3-4-5-6-8-10-12k-sg05lp3-eu-sm2-20260319-en-manual.pdf, p.48 · +1 more official manuals

AI-W5.1 ESS

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

Heat sink high temperature failure — Heat sink temperature is too high.

Cause: The inverter heat-sink temperature exceeded its limit - working environment temperature too high or insufficient cooling.

How to fix it

  1. Check whether the work environment temperature is too high; turn the inverter off for 10 minutes and restart.
  2. Seek help from Deye if it does not recover.

Source: ai-w5-1-b-datasheet.pdf, p.48

GB-SL / GB-SL Pro ESS

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

Heatsink_HighTemp_Fault — Heat sink temperature is too high.

Cause: The inverter heat-sink temperature exceeded its limit - working environment temperature too high or insufficient cooling.

How to fix it

  1. Check whether the working environment temperature is too high; turn the inverter off for 10 minutes and restart.
  2. Seek 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.51 · gb-s5k-eu-gb-s20k-eu-datasheet.pdf, p.46

Frequently asked questions

What does error 64 mean on a DEYE inverter?
It depends on the model — 12 devices use code 64. On the SUN G01P3-EU-BM8 Series it means: IGBT heat sink high temperature. The card for each model on this page gives its exact meaning and fix.
Is error 64 a fault or a warning?
64 is a fault code: the inverter cuts its output and the red LED stays solid until it is cleared.
How do I clear or fix error 64?
1. Check the temperature sensor; check that the firmware is suitable for the hardware and that the inverter is its right model. The exact steps for each affected model are listed on this page.

Related error codes

Other codes on the SUN G01P3-EU-BM8 Series

All SUN G01P3-EU-BM8 Series codes All SUN G02P1-EU Series codes

Other codes on the SUN G03/G01P3-AM8 Series

All SUN G03/G01P3-AM8 Series codes

Other codes on the SUN G04/G05/G06 3-Phase

All SUN G04/G05/G06 3-Phase codes All SUN G04P1/G05P1 Series codes All SUN G06P3-EU Series codes

Other codes on the SUN LP1 Hybrid Series

All SUN LP1 Hybrid Series codes

Other codes on the SUN SG01HP3/SG02HP3 Hybrid

All SUN SG01HP3/SG02HP3 Hybrid codes

Other codes on the SUN SG02LP2-US Hybrid

All SUN SG02LP2-US Hybrid codes All SUN SG04LP3/SG05LP3 Hybrid codes

Prefer the full written guide? Read the complete DEYE inverter error-code guide

Compiled from official DEYE user manuals. Always consult your device manual and a qualified technician before performing repairs.