INV NTC is disconnected
Also displayed as F07 on some models.
Warning — the red LED flashes and the inverter keeps running. Deal with it before it escalates.
Severity differs by model — check your model below.
The exact meaning depends on your model:
Also applies to:IVPS2512IVPS2524IVPS3524IVPS5024IVPS5048IVPS7548IVPS-7548IVPS10048+9
INV NTC is disconnected — The inverter temperature sensor (NTC) is disconnected.
Cause: The inverter temperature sensor wiring is disconnected or the sensor failed.
Contact the repair center.
Source: IVPS-IVPM User Guide.pdf, p.18 · IVPS3524P1G1-LV IVPS5048P1G1-LV IVPS7548P2G1 IVPS10048P2G1 User Guide - EN.pdf, p.27
Also applies to:IVCM2024 PROIVCM3024 PRO
Battery voltage too high — Battery voltage is too high.
Cause: The measured battery voltage is above the allowed maximum for the configured system voltage: either an external source is overcharging the battery, or an internal measurement or charging component has failed.
Source: ICM.pdf, p.13
Also applies to:T-REX-3K6LP1G01T-REX-4KLP1G01T-REX-4K6LP1G01T-REX-5KLP1G01T-REX-6KLP1G01
Battery voltage is too high — The battery voltage is too low, it should be charging.
Cause: When shown as a fault, the battery voltage at the terminals is above the inverter's permitted range — usually a battery bank whose specification or series count does not match the unit. The same number appears in the warning list for low battery voltage, meaning the pack needs charging.
Check if spec and quantity of batteries are meet requirements.
Source: T-REX-3_3.6_4_4.6_5_6KLP1G01-hybrid-inverter-user-guide-English.pdf, p.37
Also applies to:IVEM6048IVEM8048-LVIVEM8048
Output voltage is too low
Cause: Connected load is too high or internal failure.
Source: felicitysolar IVEM 6048 Solar Inverter User Guide.pdf, p.37 · FelicitySolar IVEM8048-LV Single Phase Hybrid Inverter User Guide.pdf, p.38
Also applies to:IVEM12048-IIIVEM 8K-12K Series II
Output voltage is too low
Cause: Output voltage below acceptable range, possibly due to overload.
Source: IVEM8K-12K-II_compressed.pdf, p.43
Also applies to:T-REX-10KLP3G01
Battery voltage is too high
Cause: Battery specification or quantity does not meet requirements.
Check if spec and quantity of batteries are meet requirements.
Source: T-REX-10KHP3G01-Inverter-User-Guide.pdf, p.28 · T-REX-10KLP3G01-Inverter-User-Guide.pdf, p.27
PV3 overcurrent fault — The current of the PV3 is too large, check the string current.
Cause: Current from the PV3 string exceeded the input stage's protection limit — more current than that MPPT channel is rated to carry.
Source: T-REX-50KHP3G01-user-manual-.pdf, p.45
Also applies to:Apollo-5KLP1G01-M1Apollo-5KLP1G01-M2Apollo-4K6LP1G01-MXApollo-4K6LP1G01-M1Apollo-4K6LP1G01-M2
Battery voltage is too high — Battery voltage exceeds the maximum allowed value.
Cause: Battery voltage is too high.
Check if spec and quantity of batteries are meet requirements.
Source: Apollo-5KLP1G01-All-in-one-ESS-User-Guide.pdf, p.42
Also applies to:LUX-X-96050HMG01LUX-X-96050HCG01
High BMS Temperature — BMS internal temperature has exceeded safe operating limit.
Cause: BMS overheating due to high ambient temperature, poor ventilation, or high current operation.
Stop charging and discharging, wait for the temperature to drop.
Source: LUX-X-96050HG01-Lithium-Battery-User-Guide.pdf, p.21
Also applies to:LUX-Y-48100HCG01LUX-Y-48100HMG01LUX-Y-48100HR13G01LUX-Y-48100HR9G01
High BMS Temperature — BMS temperature is too high.
Cause: BMS overheating due to high ambient temperature, poor ventilation, or high-current operation.
Stop charging and discharging, wait for the temperature to drop.
Source: LUX-Y-48100HG01-Lithium-Battery-User-Guide.pdf, p.20
High BMS Temperature
Cause: BMS overheating due to high ambient temperature, poor ventilation, or high-current operation.
Source: LUX-Y-48100HG01MN User manual 358-S010025-03 0325(V2.0).pdf, p.27
Also applies to:SCCM4524-IIISCCM4548-IIISCCM6048-IIISCCM8048-IIISCCM10048-IIISCCM12048-III
Battery temperature is too high — Detected battery temperature exceeds the safe charging range.
Cause: Battery ambient temperature is too high, or remote temperature sensor (RTS) is faulty, disconnected, or reporting incorrect values.
Source: felicitysolar SCCM-III MPPT Solar Charge Controller User Guide.pdf, p.18
Heat sink temperature is too high — Fault event: heat sink temperature exceeded its high threshold.
Cause: The heat-sink temperature exceeded its upper protection limit — high ambient temperature, blocked ventilation, or sustained high-power operation.
Source: LUX-S-1600LG01.pdf, p.22
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.