Felicity error codes · from the official manuals

Felicity error codes — what they mean and how to fix them.

Seeing a code on your Felicity inverter or battery? Search the code or pick your device — you'll get what it means, what caused it, and the fix, straight from the official manuals.

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46devices
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Inverters

14 models · 627 codes

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27 models · 503 codes

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5 models · 226 codes

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The codes owners look up most often — tap yours to jump straight to the fix.

Programming a solar inverter, and reading the codes

Most codes are a setting, not a failure

Battery type, charge current, cut-off voltage and load priority account for most of what appears on the screen. Each model page carries its spec table and datasheet — that is the reference before any parameter is changed.

Charge controller setup comes first

A controller is set to the battery chemistry before anything else — lithium, gel or OPzV — then to absorption and float voltage. The values differ by chemistry, and a controller set to the wrong one is the commonest reason a battery drains fast.

The written guideThe complete Felicity inverter error-code guideOne page that walks through the most common codes, what the lights and beeps mean, and the checks worth running before you call anyone.Read the guide
Still showing a code?Send us the code and your model number — a technician replies on WhatsApp. If the unit needs replacing, order it online.
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How Felicity error codes work

Most Felicity inverters report problems as a number on the LCD — some models print it plain (15), others with an F in front (F15). Both are the same code, and this database merges them onto one page. Batteries and BMS protection events use letter prefixes such as C-codes, and a few units report E-codes or named alarms. What matters most is the red light next to the code: solid red means a fault — the unit has cut its output to protect itself — while flashing red means a warning, and the unit keeps running while it asks you to fix the cause. On some models the same number exists as both a fault and a warning, so the light tells you which table you are in.

When to call a technician

Warnings are usually within reach of a careful owner: reduce the load, check the battery voltage on the screen, or let the unit cool, exactly as the fix on each code page describes. A fault that comes straight back after a full restart means the inverter has detected a hardware problem or an unsafe condition — do not keep power-cycling it. Note the code and your model number and send them to a technician; every code page here lists the source manual and page so the context travels with you. Always disconnect AC, DC, and the battery before opening any enclosure.

Common questions about Felicity error codes

These are the questions owners and installers ask most often when a code appears on the screen.

What does error 15 mean on a Felicity inverter?
It depends on the model, which is why the code 15 page lists every affected device separately. On the IVPS and IVPM families, code 15 is an output short-circuit fault: the unit cuts its output and the red light stays solid — disconnect the AC output wiring, restart, and inspect the wiring and loads before reconnecting. On T-REX hybrids the same number reports a current-sensor fault, and IVEM models use F15 for abnormal PV power. Find your model on the code page for the exact cause and fix.
Are these the same codes as in the official Felicity manuals?
Yes. Every entry is compiled from 47 official Felicity Solar user manuals, and each code shows the source manual filename and page number so you — or your technician — can check the original context in seconds.
My model is not listed — what should I do?
The database currently covers 46 Felicity devices across inverters, batteries, energy storage, charge controllers, and EV charging. Many models are documented as variants of a sibling unit, so check the "also covers" line on the closest device page first. Still nothing? Message us on WhatsApp with your model number and the code on the screen — support is free and we add new manuals as they are released.

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