Radiator 2 over-temperature
Also displayed as F35 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:IVCM2024 PROIVCM3024 PRO
Radiator 2 over-temperature — Overtemperature occurs in radiator 2.
Cause: Inverter internal temperature has exceeded the safe operating threshold. Causes include high ambient temperature, blocked cooling vents, failed cooling fan, or installation in direct sunlight.
Check whether the air flow of the unit is blocked or whether the ambient temperature is too high.
Source: ICM.pdf, p.14
Also applies to:IVGM6KL-P1G1IVGM7K6L-P1G1IVGM8KL-P1G1
BUCK-BOOST Current sensor fault — Grid frequency is too high, check if the grid frequency is within the normal range.
Cause: When raised as a fault, the buck-boost converter's current sensor has returned a reading the control board cannot trust. The same code number is used in the alarm list for grid frequency running above the permitted range.
Source: Felicitysolar IVGM Series Hybrid inverter Instruction Manual.pdf, p.51 · Felicitysolar IVGM Series Hybrid inverter Instruction Manual.pdf, p.53
Also applies to:T-REX-3K6LP1G01T-REX-4KLP1G01T-REX-4K6LP1G01T-REX-5KLP1G01T-REX-6KLP1G01
The inner temperature over
Cause: The temperature inside the enclosure exceeded its limit — high ambient temperature or blocked airflow is the usual reason.
Check whether the ambient temperature is too high.
Source: T-REX-3_3.6_4_4.6_5_6KLP1G01-hybrid-inverter-user-guide-English.pdf, p.38
Also applies to:IVEM6048IVEM8048-IIIVEM12048-IIIVEM 8K-12K Series II
Overvoltage occurs in BUS
Cause: AC surge or PV surge or internal components failed.
Restart the unit, if the error persists, contact the repair center.
Source: felicitysolar IVEM 6048 Solar Inverter User Guide.pdf, p.38 · IVEM8K-12K-II_compressed.pdf, p.44
Also applies to:T-REX-10KLP3G01
The inner temperature over
Cause: Ambient temperature is too high.
Check whether the ambient temperature is too high.
Source: T-REX-10KHP3G01-Inverter-User-Guide.pdf, p.29 · T-REX-10KLP3G01-Inverter-User-Guide.pdf, p.28
Bus software overvoltage fault — Bus voltage is too high, shutdown and restart.
Cause: The control firmware measured the internal DC bus above its protection ceiling — a regulation fault in the conversion stages or a surge fed in from the PV or AC side.
Source: T-REX-50KHP3G01-user-manual-.pdf, p.46
Also applies to:Apollo-5KLP1G01-M1Apollo-5KLP1G01-M2Apollo-4K6LP1G01-MXApollo-4K6LP1G01-M1Apollo-4K6LP1G01-M2
The inner temperature over — Inner temperature exceeds the allowed limit.
Cause: The inner temperature over.
Check whether the ambient temperature is too high.
Source: Apollo-5KLP1G01-All-in-one-ESS-User-Guide.pdf, p.43
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.