Inv soft start timeout
Also displayed as F22 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:
Also applies to:IVPS2512IVPS2524IVPS3524IVPS5024IVPS5048IVPS7548IVPS-7548IVPS10048+9
Inv soft start timeout — The inverter soft start did not complete in time.
Cause: At power-up the soft-start ramp failed to bring the inverter stage to its working point within the allowed time — an internal power-stage or pre-charge fault.
Contact the repair center.
Source: IVPS-IVPM User Guide.pdf, p.17 · ivps3524p1g1-lv-ivps5048p1g1-lv-ivps7548p2g1-ivps10048p2g1-manual.pdf, p.24
Also applies to:IVCM2024 PROIVCM3024 PRO
Output voltage too low — Output voltage is too low.
Cause: The AC output voltage sagged below the allowed range, most often because a heavy load is dragging the output down, otherwise an internal voltage-regulation fault.
Source: ICM.pdf, p.14
Also applies to:IVGM6KL-P1G1IVGM7K6L-P1G1IVGM8KL-P1G1
Battery Under Voltage Alarm or Battery SOC Low Alarm — Battery voltage is too low or Battery SOC is too low, the battery should be charged.
Cause: Either the measured battery voltage or the reported state of charge has fallen to the low-battery threshold — the pack is close to empty and must be recharged.
Source: Felicitysolar IVGM Series Hybrid inverter Instruction Manual.pdf, p.51
Also applies to:T-REX-3K6LP1G01T-REX-4KLP1G01T-REX-4K6LP1G01T-REX-5KLP1G01T-REX-6KLP1G01
Output voltage is too low
Cause: The AC output voltage sagged below the permitted range — usually the connected load exceeds what the inverter can hold voltage into.
Reduce the connected load.
Source: t-rex-3-3.6-4.6-5-6klp1g01-user-guide-english.pdf, p.38
Also applies to:IVEM6048
DCDC current sensor failed
Cause: DC/DC current sensor hardware failure.
Restart the unit, if the error persists, contact the repair center.
Source: felicitysolar IVEM 6048 Solar Inverter User Guide.pdf, p.37
Also applies to:IVEM12048-IIIVEM 8K-12K Series II
DCDC current sensor failed
Cause: DCDC current sensor failure.
Restart the unit, if the error persists, contact the repair center.
Source: IVEM8K-12K-II_compressed.pdf, p.44
Also applies to:IVEM8048
DCDC current sensor failed
Cause: The DC/DC current sensor returned an out-of-range or implausible reading, so the control board can no longer trust that stage's current measurement.
Restart the unit, if the error persists, contact the repair center.
Source: FelicitySolar IVEM8048-LV Single Phase Hybrid Inverter User Guide.pdf, p.38
Also applies to:T-REX-10KLP3G01
Output voltage is too low
Cause: Connected load is too high.
Reduce the connected load.
Source: T-REX-10KHP3G01-Inverter-User-Guide.pdf, p.28 · t-rex-10klp3g01-inverter-user-guide-english.pdf, p.28
Battery 1 overcurrent fault — Battery 1 current is too large, check the battery charge and discharge power.
Cause: Battery 1 current tripped the hardware overcurrent protection, which acts independently of the firmware — a fast surge in charge or discharge current on that channel.
Source: t-rex-25-50khp3g01-user-guide-en.pdf, p.46
Also applies to:Apollo-5KLP1G01-M1Apollo-5KLP1G01-M2Apollo-4K6LP1G01-MXApollo-4K6LP1G01-M1Apollo-4K6LP1G01-M2
Output voltage is too low
Cause: Output voltage is too low.
Reduce the connected load.
Source: t-rex-5klp1g01-t-rex-6klp1g01-datasheet-en.pdf, p.43
Batter Relay Error — Fault event: battery relay (contactor) error/failure to open or close as commanded.
Cause: Communication has been lost between the inverter and a peripheral device — typically a battery BMS, smart meter, or external monitoring dongle.
Source: LUX-S-1600LG01.pdf, p.22
It depends on the model — 13 devices use code 22. On the IVPS/IVPM Series it means: Inv soft start timeout. The card for each model on this page gives its exact meaning and fix.
22 is a fault code: the inverter cuts its output and the red LED stays solid until it is cleared.
Contact the repair center. The exact steps for each affected model are listed on this page.
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.