52Fault

Felicity inverter error 52 (F52)

AC voltage DC component fault

Also displayed as F52 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:

IVGM5KL-P1G1

InverterFault

Also applies to:IVGM6KL-P1G1IVGM7K6L-P1G1IVGM8KL-P1G1

What it means

AC voltage DC component fault — DC component detected in AC voltage output.

Cause: A DC offset beyond the permitted limit was detected riding on the AC output voltage — the output stage is no longer producing a symmetrical sine wave.

How to fix it

  1. Restart the system 2~3 times
  2. If the fault still exists, please contact us for help.

Source: Felicitysolar IVGM Series Hybrid inverter Instruction Manual.pdf, p.54

T-REX-3KLP1G01

InverterFault

Also applies to:T-REX-3K6LP1G01T-REX-4KLP1G01T-REX-4K6LP1G01T-REX-5KLP1G01T-REX-6KLP1G01

What it means

BMS require inverter to charge battery

Cause: The battery's BMS has requested charging over the communication link — the pack needs energy, and the inverter starts charging automatically.

How to fix it

Restart the unit, if the error persists, contact the repair center.

Source: T-REX-3_3.6_4_4.6_5_6KLP1G01-hybrid-inverter-user-guide-English.pdf, p.37 · T-REX-3_3.6_4_4.6_5_6KLP1G01-hybrid-inverter-user-guide-English.pdf, p.39

T-REX-10KHP3G01

InverterFault

Also applies to:T-REX-10KLP3G01

What it means

DSP2 communication failure

Cause: Communication has been lost between the inverter and a peripheral device — typically a battery BMS, smart meter, or external monitoring dongle.

How to fix it

Restart the unit, if the error persists, contact the repair center.

Source: T-REX-10KHP3G01-Inverter-User-Guide.pdf, p.29 · T-REX-10KLP3G01-Inverter-User-Guide.pdf, p.29

T-REX-50KHP3G01

InverterFault

What it means

Grid Undervoltage Fault — The grid voltage is too low, check whether the grid voltage is within the normal range.

Cause: The grid voltage measured at the AC terminals is below the inverter's permitted operating window, so it disconnects until the grid recovers.

How to fix it

  1. Power down the inverter, wait 5 minutes for capacitors to discharge, then restart.
  2. If the fault recurs immediately or repeatedly, record the exact code and contact your installer or the manufacturer's service line.

Source: T-REX-50KHP3G01-user-manual-.pdf, p.47

Apollo-5KLP1G01-MX

Energy storage systemCritical

Also applies to:Apollo-5KLP1G01-M1Apollo-5KLP1G01-M2Apollo-4K6LP1G01-MXApollo-4K6LP1G01-M1Apollo-4K6LP1G01-M2

What it means

DSP2 communication failure

Cause: DSP2 communication failure.

How to fix it

Restart the unit, if the error persists, contact the repair center.

Source: Apollo-5KLP1G01-All-in-one-ESS-User-Guide.pdf, p.44

Frequently asked questions

What does error 52 mean on a Felicity inverter?
It depends on the model — 6 devices use code 52. On the IVGM5KL-P1G1 it means: AC voltage DC component fault. The card for each model on this page gives its exact meaning and fix.
Is error 52 a fault or a warning?
52 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 52?
1. Restart the system 2~3 times; 2. The exact steps for each affected model are listed on this page.

Related error codes

Other codes on the IVGM5KL-P1G1

All IVGM5KL-P1G1 codes

Other codes on the T-REX-3KLP1G01

All T-REX-3KLP1G01 codes

Other codes on the T-REX-10KHP3G01

All T-REX-10KHP3G01 codes All T-REX-10KLP3G01 codes

Other codes on the T-REX-50KHP3G01

All T-REX-50KHP3G01 codes

Other codes on the Apollo-5KLP1G01-MX

All Apollo-5KLP1G01-MX codes

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

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