Flamezum Inverter Fault Codes: Meaning and Fixes

Learn what Flamezum inverter fault codes mean, how to fix LO, OH, HI, OL, and other errors, and how to prevent shutdowns. Complete troubleshooting and safety guide.

Power inverters are incredibly helpful when you need clean AC electricity during camping, RV trips, emergency backup, or solar home systems. But even a well-built inverter like Flamezum can stop working when a fault code shows up on the screen.

When a Flamezum inverter shuts down and displays LO, OH, HI, OL, or a number such as Fault 2–9, it means something has gone outside the safe operating range. Understanding these fault codes is the key to keeping your inverter healthy, your devices protected, and your power system running smoothly.

This guide breaks down every known Flamezum inverter fault code, explains why it happens, how to fix it, and how to prevent it from coming back. You’ll also learn maintenance tips and real-world causes that many users run into.

Let’s dive in.

What Are Flamezum Inverter Fault Codes?

Flamezum inverters display alarms and fault codes whenever the system detects unsafe conditions. Instead of silently failing or overheating, the inverter shows a code and shuts down to protect:

• The battery

• The inverter’s internal components

• Your connected appliances

The most common Flamezum inverter fault codes are:

These codes appear either on the built-in LCD screen or as blinking indicators depending on the model (1500W, 2000W, 2500W, 3000W, etc.).

Why Fault Codes Matter

A fault code is not just an error message. It’s a warning system.

Your Flamezum inverter is built with multiple protection circuits. When any of these conditions become unsafe, the inverter turns itself off instead of burning out or damaging your battery bank.

Fault codes help you:

• Identify the exact problem

• Fix the issue faster

• Avoid long-term inverter damage

• Prevent safety hazards

• Protect your appliances

• Maintain power efficiency

Many inverter failures happen because users ignore the early signs. Fixing issues immediately is always smarter than waiting for complete failure.

Common Flamezum Inverter Fault Codes and Fixes

Flamezum Inverter Fault Codes and Fixes

Below you’ll find the full explanation for every major Flamezum fault code, including symptoms, possible causes, step-by-step fixes, and prevention tips.

LO – Low Voltage Shutdown

Meaning

Your Flamezum inverter shuts down to protect itself because the DC input voltage has dropped below the safe limit.

Symptoms

• LO displayed on screen

• Inverter beeps

• Output stops

• Fans may slow down

Possible Causes

• Battery is discharged

• Battery cables are too thin or too long

• Loose battery terminals

• Old or failing battery

• Wrong battery type

• Excessive load causing voltage drop

How to Fix LO

1. Check battery voltage using a multimeter
   Ensure the voltage matches your inverter’s requirements (usually 12V or 24V).

2. Recharge the battery fully

3. Inspect all battery terminals
   Tighten loose connections and clean corrosion.

4. Use proper cable thickness
   Long or thin cables reduce voltage and trigger LO.

5. Reduce load temporarily
   Heavy loads make the voltage sag under pressure.

6. Replace old batteries
   Weak batteries drop voltage quickly under load.

How to Prevent LO

• Charge batteries regularly

• Use shorter, thicker cables

• Avoid running high-watt loads on drained batteries

• Install a low-voltage alarm

• Keep battery terminals clean

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HI – High Voltage Shutdown

Meaning

The input voltage going into the inverter is too high.

Symptoms

• HI flash

• Alarm sound

• Instant shutdown

Possible Causes

• Overcharged battery

• Wrong battery charger settings

• Solar charge controller malfunction

• Mixing old and new batteries

• Incorrect system voltage (12V device on 24V battery)

How to Fix HI

1. Check battery voltage
   If voltage is unusually high, stop charging immediately.

2. Inspect your solar charge controller
   Wrong settings can overshoot voltage.

3. Check battery type settings
   Use correct profiles (AGM, Gel, Lithium, etc.).

4. Inspect wiring
   A misconfigured battery bank can send high voltage.

5. Disconnect charger temporarily
   Let the system balance.

Preventing HI Faults

• Use a high-quality charge controller

• Double-check voltage compatibility

• Never mix battery types or ages

• Keep charging settings consistent

OH – Overheat (Over-Temperature) Shutdown

Meaning

Internal temperature is too high and the inverter has turned off to protect itself.

Why It Happens

• Poor ventilation

• Placing inverter near heat sources

• Blocked air intake

• Fan failure

• Excessive load for long periods

• Dust buildup

Symptoms

• OH code

• Hot casing

• Loud fans before shutdown

• Distorted output before shutdown

How to Fix OH

1. Turn off the inverter and let it cool
   Wait at least 10–20 minutes.

2. Improve airflow
   Move the inverter to a ventilated area.

3. Check cooling fans
   Replace worn-out fans.

4. Reduce load
   Continuous heavy loads generate more heat.

5. Clean dust
   Dust blocks airflow and reduces cooling efficiency.

Preventing OH

• Keep the inverter in open space

• Clean dust filters regularly

• Avoid running heavy loads continuously

• Ensure fans spin smoothly

OL – Overload or Short Circuit Fault

Meaning

Your Flamezum inverter is experiencing either:

• Too much load (exceeds rated wattage)

• Short-circuit in connected appliances

• Output wiring fault

Symptoms

• OL on screen

• Fast beeping

• Instant shutdown

• Burn smell if severe short

Common Causes

• Running high-surge appliances

• Combining too many devices at once

• Damaged appliance cable

• Faulty wiring connection

• Internal short inside powered device

How to Fix OL

Step 1: Turn off inverter
Step 2: Disconnect all devices
Step 3: Restart inverter with NO load
→ If OL disappears, reconnect devices one by one to isolate the faulty one.

Other fixes:

• Upgrade to a higher-watt inverter

• Replace damaged extension cords

• Repair or replace the shorted appliance

• Check for exposed wires

Preventing OL

• Keep load below 80% of rated capacity

• Avoid devices with high startup surge

• Use surge protectors

• Regularly inspect wiring and appliances

Flamezum Inverter Fault Codes 2–9 Explained

Some Flamezum models show numbered codes (2 through 9) instead of text codes. These codes vary slightly between models, but generally follow this pattern:

What to Do When You See Codes 2–9

• Turn off inverter

• Disconnect all loads

• Check battery voltage

• Restart

• If code remains → internal issue

Codes 7, 8, and 9 usually mean internal board problems, blown MOSFETs, or capacitor failure. These require service or replacement.

Real-World Reasons Why Fault Codes Occur (User-Based Insights)

Many users trigger fault codes not because of inverter defects, but because of system setup mistakes. Here are the most common real situations:

1. Wrong battery voltage setup

A 24V inverter accidentally connected to a 12V battery (or vice versa) triggers HI or LO instantly.

2. Poor ventilation

Most overheats occur because the inverter is installed in:

• Under-bed compartments

• Small wooden boxes

• Car trunks

• Dusty corners

3. Undersized battery cables

Thin wires drop voltage under load, causing LO.

4. High-surge appliances

Devices like refrigerators, pumps, and motors draw 2–4x startup wattage and trip OL.

5. Solar charging problems

Incorrect charge controller settings easily cause HI.

6. Bad or old batteries

Old batteries sag under small loads, causing LO repeatedly.

7. Dust blocking fans

Dust buildup triggers OH more than anything else.

Preventive Maintenance to Avoid Fault Codes

A properly maintained inverter rarely shows fault codes. Here’s how to keep your Flamezum inverter running reliably year-round.

Weekly Checks

• Inspect battery voltage

• Listen for abnormal fan noise

• Clean around inverter

• Make sure nothing blocks airflow

Monthly Checks

• Tighten battery terminals

• Clean dust using compressed air

• Inspect cables for heating

• Test inverter with usual load

Seasonal Checks

• Adjust ventilation if summer heat increases

• Inspect battery health

• Check charger and solar controller settings

• Test high-surge appliances connected to inverter

Annual Maintenance

• Replace worn-out cooling fans

• Install new battery if capacity drops

• Evaluate if upgrade is needed

Safety Tips While Troubleshooting Inverter Faults

• Always turn off inverter before touching cables

• Never open the inverter casing unless you’re qualified

• Use insulated tools

• Replace damaged wires immediately

• Never mix battery ages or types

• Keep inverter above floor level to avoid moisture

When Should You Replace a Flamezum Inverter?

Some problems are too expensive or unsafe to repair. Replace your inverter if:

• Fault codes appear even without load

• Burning smell or smoke observed

• Internal components repeatedly fail

• Overheating occurs even in cool environments

• Output waveform becomes unstable

Modern inverters are more energy-efficient and safer than older ones, so upgrading can improve performance dramatically.

FAQs About Flamezum Inverter Fault Codes

1. What does LO mean on a Flamezum inverter?

LO means the battery voltage is too low for safe operation.

2. Why does my inverter show OL?

OL indicates overload or short circuit. Reduce load and check connected appliances.

3. What causes OH (overheat) alerts?

Poor airflow, blocked fans, dust buildup, or running high loads for long periods.

4. What should I do if I see a numbered fault code like 5 or 7?

Codes 5–9 usually indicate deeper electrical faults. Disconnect load, restart, and if it persists, seek servicing.

5. Can I reset the inverter after a fault?

Yes. But always remove the root cause first, or repeated faults can damage the inverter.

6. Can repeated OL or OH errors damage the inverter?

Yes. Frequent overload and overheating shorten inverter lifespan.

7. What triggers high voltage (HI) faults?

Overcharged batteries or incorrect solar charge controller settings.

Conclusion

Flamezum inverter fault codes are part of a smart protection system designed to keep your inverter, battery, and appliances safe. Whether you see LO, OL, OH, HI, or a numbered code like Fault 2–9, each message tells you exactly what needs attention.

By understanding the meaning of these codes and applying the step-by-step fixes, you can:

• Restore inverter performance

• Prevent recurring shutdowns

• Extend the lifespan of your system

• Maintain safer and more stable power

Regular maintenance, proper installation, quality batteries, and careful load management are the best ways to keep your Flamezum inverter running smoothly year after year.