Tesla Inverter Error Codes List: Troubleshooting Tesla-PK Inverters
Updated 7 September 2026 · By SolarNevs Research Desk, Dealer surveys + verified sources · 3 sources · Method ↗
Key Takeaways
- Overload (Fault 07) and over-temperature (Fault 02) are among the most commonly reported issues for Tesla-PK inverters.
- Always check the inverter's display for the specific fault or warning code first, then inspect the physical environment and connections.
- High DC voltages in solar arrays (up to 1000VDC) pose a lethal shock hazard. WARNING: The inverter's internal DC bus capacitors retain dangerous electrical charges after shutdown. Wait at least 5 minutes after isolating PV, battery and AC grid disconnects before removing chassis covers.
- For internal component failures (e.g., Fault 08, 09, 53, 57), DIY repair is not recommended; contact an authorized Tesla Industries Pakistan service center.
What do Tesla Inverter Error Codes Mean?
Tesla Industries Pakistan inverters, including the Infinity HLE, HSC, HSE, InfiniSolar, and Axpert VM series, use a system of two-digit fault and warning codes to indicate operational issues. Understanding these codes is the first step in troubleshooting your solar power system. It is important to note that Tesla Industries (Pvt) Ltd is an indigenous Pakistani engineering and solar equipment manufacturer, founded in 1992, and has no affiliation with Tesla, Inc. / Tesla Motors (USA). These inverters operate on the Voltronic Power OEM platform, which uses a standardized set of codes.
When your Tesla-PK inverter displays an error code, it signifies a specific event or condition that requires attention. Fault codes (01-59) typically indicate a critical issue that has caused the inverter to stop operating or enter a protective shutdown. Warning codes (01-32) alert you to a condition that is not yet critical but could lead to a fault if unaddressed. (BMS-equipped lithium installations add extended communication codes 60/61 outside this standard range) The most common issues often relate to environmental factors like temperature, or system conditions such as battery voltage and load management.
How to Interpret and Respond to Tesla Inverter Codes
Tesla Industries Pakistan inverters, built on the Voltronic OEM platform, use consistent 2-digit numerical codes for faults and warnings. Some InfiniSolar hybrid models may display these with an "F" prefix (e.g., F01, F07), but the meaning remains the same.
- Identify the Code: Note the exact fault or warning code displayed on the inverter's LCD screen. Pay attention to any accompanying audible alarms or LED indicators.
- Consult the Table: Refer to the comprehensive table below to find the specific meaning, trigger conditions, and initial diagnostic steps for your code.
- Perform Initial Checks: Many codes point to external factors like loose connections, blocked fans, or excessive loads. Start with simple, observable checks.
- Prioritize Safety: Always follow safety guidelines, especially when dealing with high voltages or batteries.
- Document: Keep a record of the code, when it occurred, and any actions you took. This helps technicians if further assistance is needed.
Tesla Inverter Fault and Warning Code Table
This table provides a comprehensive list of fault and warning codes for Tesla Industries Pakistan inverters, including the Infinity HLE, HSC, HSE, InfiniSolar, and Axpert VM series. These codes are verified against the Voltronic off-grid/hybrid firmware used by the Infinity HLE, HSE, and Axpert VM lines; three-phase HSC and Infini Plus commercial models may use an extended or differing code set — if a code's meaning does not match your unit's behaviour, consult your model's own manual.
Code | Type | Meaning / Fault Event | Trigger Condition & Diagnostics | Fix Direction / Recommended Action |
|---|---|---|---|---|
Fault 01 | Fault | Fan is locked when inverter is off | Internal cooling fan jammed, dust clogged, or tachometer signal disconnected during standby. | Clean dust/debris from fan grille; verify fan connector; replace 12V/24V cooling fan if motor burned out. WARNING: The inverter's internal DC bus capacitors retain dangerous electrical charges after shutdown. Wait at least 5 minutes after isolating PV, battery and AC grid disconnects before removing chassis covers. |
Fault 02 | Fault | Over temperature | Internal heatsink, transformer, or power semiconductor temperature exceeds thermal cutoff (>100°C). | Ensure ≥200mm side and ≥500mm top clearance; clear air intake filters. Before touching the air intake filters, switch the unit off, isolate PV, battery and AC, and wait at least 5 minutes for the internal capacitors to discharge. Reduce heavy continuous loads. |
Fault 03 | Fault | Battery voltage is too high | Battery bank voltage exceeds high DC cut-off threshold (>16.0 V on 12 V, >33.0 V on 24 V, >63.0 V on 48 V). | Verify battery quantity and series wiring; test individual battery voltages; verify Program 26/27 charge voltage parameters. |
Fault 04 | Fault | Battery voltage is too low | Battery voltage drops below the low DC cut-off threshold (default 21.0 V for 24 V / 42.0 V for 48 V; adjustable via Program 29, so tubular or lithium setups may cut off at higher voltages). | Re-charge battery from WAPDA grid or solar PV; check for dead/shorted cells; test specific gravity of tubular electrolyte. |
Fault 05 | Fault | Output short circuited | Direct AC output short circuit detected or severe wiring bridge in distribution box. | Turn off AC output breaker immediately; inspect load wiring, neutral loops, and appliances for short circuits. |
Fault 06 | Fault | Output voltage is too high | Inverter AC output voltage deviates above safety threshold (>260VAC). | Reduce connected capacitive/reactive load; power cycle inverter; if persistent, internal feedback control failed. |
Fault 07 | Fault | Overload time out | Connected load exceeds inverter rated capacity (≥110% load for 5s, or 105%–110% load for 10s). | Shed heavy inductive appliances (refrigerators, air conditioners, water pumps); reset unit; enable overload bypass in Program 23. |
Fault 08 | Fault | Bus voltage is too high | High-voltage DC bus capacitor voltage exceeds safe operating limit (>500VDC). | Restart inverter after grid/PV voltage stabilizes; if persistent, internal DC bus clamp circuit damaged. |
Fault 09 | Fault | Bus soft start failed | DC bus soft-start resistor or charging circuit failed to ramp up bus voltage smoothly upon power-up. | Power cycle inverter; check for severe PV surge or battery ground fault; internal hardware repair required. |
Fault 10 | Fault | PV over current | Solar panel array current exceeds maximum MPPT input rating (e.g. >27A). | Reconfigure PV string parallel combinations; ensure array short-circuit current is within inverter specs. |
Fault 51 | Fault | Over current or surge | Instantaneous current surge detected on inverter output bridge or DC power stage. | Disconnect heavy motor startup loads; restart unit; if fault does not clear, output MOSFET/IGBT damaged. |
Fault 52 | Fault | Bus voltage is too low | DC bus voltage collapsed under sudden heavy load step or severe battery voltage drop. | Check battery health. Switch the inverter off and open the DC battery breaker before touching any terminals, then verify battery cable cross-section (≥25mm²) and ensure battery terminal lugs are tight with insulated tools. Wait at least 5 minutes after isolating PV, battery, and AC grid disconnects before removing chassis covers. |
Fault 53 | Fault | Inverter soft start failed | AC output bridge failed to ramp up AC output voltage cleanly at start-up. | Disconnect all AC loads during inverter startup; restart unit; if persistent, internal board service needed. |
Fault 55 | Fault | Over DC voltage in AC output | DC offset component detected in AC output waveform (> allowable threshold). | Disconnect loads and test output; internal output DC decoupling filter or transformer stage failure. |
Fault 56 | Fault | Battery connection is open / disconnected | Battery terminals disconnected, battery circuit breaker open, or battery sensing wire broken while running. | Switch the inverter off and open the DC battery breaker before touching any terminals, then check all battery cables, terminal lugs, and the battery fuse with insulated tools. WARNING: The inverter's internal DC bus capacitors retain dangerous electrical charges after shutdown. Wait at least 5 minutes after isolating PV, battery, and AC grid disconnects before removing chassis covers. |
Fault 57 | Fault | Current sensor failed | Internal Hall current transducer or op-amp sensing circuit drift / failure. | Power cycle inverter; return to authorized Tesla service center if current sensor error persists. |
Fault 58 | Fault | Output voltage is too low | Inverter AC output voltage drops below acceptable minimum threshold (<190VAC). | Reduce connected load; check battery capacity; return for service if unloaded output voltage remains low. |
Fault 59 | Fault | PV voltage is beyond acceptable range | Solar PV string open-circuit voltage exceeds your model's maximum PV input limit (e.g., 80VDC for PWM models like Axpert PVS 3KW, 450–550VDC for MPPT single-phase models; up to 1000VDC three-phase — always check the nameplate VOC rating). | Reduce number of solar panels wired in series per string. Before touching any PV wiring, switch the unit off, isolate PV, battery and AC, and wait at least 5 minutes for the internal capacitors to discharge. Recalculate array VOC for winter cold temperatures. Unauthorized internal repairs can void your inverter's warranty. Note: Max VOC varies significantly by model (e.g., 80VDC for Axpert PVS 3KW, 450-550VDC for MPPT single-phase models, up to 1000VDC for three-phase models) – always check your unit's nameplate. |
Warning 01 | Warning | Fan is locked when inverter is on | Cooling fan blocked or failing while inverter is actively operating (Beep 3x/sec). | Clear dust from fan housing immediately; verify fan spin. Before touching the fan housing or replacing the fan, switch the unit off, isolate PV, battery and AC, and wait at least 5 minutes for the internal capacitors to discharge. Replace fan before thermal trip occurs. Unauthorized internal repairs can void your inverter's warranty. |
Warning 02 | Warning | Over temperature | Inverter heatsink temperature elevated; approaching thermal derating limit (No audible alarm). | Improve ventilation; ensure no direct sunlight on inverter body. Before cleaning the filter sponge, switch the unit off, isolate PV, battery and AC, and wait at least 5 minutes for the internal capacitors to discharge. |
Warning 03 | Warning | Battery is over-charged | Battery bank voltage higher than standard charging curve (Beep 1x/sec). | Verify charging voltage set in Program 26/27; calibrate user battery parameters; check solar controller. |
Warning 04 | Warning | Low battery | Battery voltage approaching low DC cut-off threshold (Beep 1x/sec). | Allow solar/grid to charge battery bank; reduce non-critical DC/AC loads during power outage. |
Warning 07 | Warning | Overload | Connected load between 100% and 110% of rated capacity (Beep 1x every 0.5 sec). | Reduce connected appliances before the 10-second overload countdown trips into Fault 07. |
Warning 10 | Warning | Output power derating | Output power derated due to high temperature or low AC input voltage (<170V) (Beep 2x every 3s). | Provide active cooling; adjust AC input range in Program 03 from UPS to Appliance mode (90–280V). |
Warning 15 | Warning | PV energy is low | Solar panel generation insufficient to support load or charging (Beep 2x every 3s). | Normal at dawn/dusk/cloudy days; check for panel shading, heavy dust buildup, or blown DC string fuse. |
Warning 16 | Warning | High AC input (>280VAC) during BUS soft start | Utility grid voltage exceeds 280VAC during bus initialization (No audible alarm). | Wait for grid voltage to normalize; install external voltage stabilizer if WAPDA voltage fluctuates high. |
Warning 32 | Warning | Communication failure between inverter and display panel | Removable LCD display / control board flat ribbon cable loose or damaged (No audible alarm). | Reseat the RJ45/ribbon cable connecting the front LCD display module to the main inverter motherboard. WARNING: The inverter's internal DC bus capacitors retain dangerous electrical charges after shutdown. Wait at least 5 minutes after isolating PV, battery and AC grid disconnects before removing chassis covers. |
Warning 60 / 61 | Warning / Fault | BMS communication lost / Lithium battery comm error | RJ45 communication loss between lithium battery BMS and inverter BMS port on Tesla Infinity/Axpert. | Check custom RJ45 cable pinout (PIN 3/5 RS485 or PIN 6/7 CAN); verify protocol selection in Prog 05 (PYL/Lib). |
Common Error Code Categories and Troubleshooting
Tesla-PK inverter error codes often fall into several categories, guiding your troubleshooting efforts.
Fan and Temperature Issues (Fault 01, 02, Warning 01, 02)
These codes relate to the inverter's cooling system. Fault 01 and Warning 01 indicate a locked or failing fan. Fault 02 and Warning 02 point to high internal temperatures.
- Check: Ensure the inverter has adequate clearance (≥200mm side, ≥500mm top) for airflow, and verify the fan is spinning. Before touching the fan grilles or the anti-dust filter sponge (recommended monthly), switch the unit off, isolate PV, battery and AC, and wait at least 5 minutes for the internal capacitors to discharge — they retain dangerous charge after shutdown.
- Fix: Clear obstructions, clean filters, and if the fan is faulty, it may need replacement. WARNING: The inverter's internal DC bus capacitors retain dangerous electrical charges after shutdown. Wait at least 5 minutes after isolating PV, battery and AC grid disconnects before removing chassis covers. Reducing the load can help lower internal temperatures.
Battery Voltage Problems (Fault 03, 04, 56, Warning 03, 04)
These codes are critical for battery health and system operation. Fault 03 indicates over-voltage, while Fault 04 and Warning 04 signal low battery voltage. Fault 56 means the battery connection is open.
- Check: Verify battery wiring for correct series/parallel connections and tight terminal lugs. Measure individual battery voltages. Check the battery circuit breaker and fuses.
- Fix: For low voltage, recharge the battery. For high voltage, check charging parameters in Program 26/27. Re-secure any loose battery connections. For persistent issues, consult guides like
/pk/guides/fixes/solar-battery-not-chargingor/pk/guides/fixes/phoenix-battery-low-gravity-revival-steps.
Output and Overload Issues (Fault 05, 06, 07, 51, 55, 58, Warning 07, 10)
These codes relate to the inverter's AC output and load management. Fault 07 and Warning 07 are common overload indicators. Fault 05 signals a short circuit.
- Check: Immediately disconnect loads. Inspect AC wiring for short circuits. Note if heavy inductive loads (like motors) are starting simultaneously.
- Fix: Reduce connected loads. Consider enabling overload bypass in Program 23 to transfer to grid power during overloads. For persistent output issues, refer to
/pk/guides/fixes/inverter-shows-error-but-no-output.
PV Input Issues (Fault 10, 59, Warning 15)
These codes indicate problems with the solar panel array input. Fault 10 means PV over current, and Fault 59 means PV voltage is too high. Warning 15 indicates low PV energy.
- Check: Verify the number of solar panels in series and parallel strings to ensure they are within the inverter's maximum voltage (e.g., 80VDC for PWM models like Axpert PVS 3KW, 450–550VDC for MPPT single-phase models; up to 1000VDC three-phase — always check the nameplate VOC rating) and current limits (e.g., >27A). Check for panel shading or dust.
- Fix: Reconfigure PV strings if voltage or current limits are exceeded. Clean panels.
Internal System Faults (Fault 08, 09, 53, 57)
These codes typically point to internal hardware failures within the inverter, such as bus voltage issues or current sensor malfunctions.
- Check: Power cycling the inverter may temporarily clear these.
- Fix: These faults usually require advanced diagnostics and internal component repair by an authorized service center.
Communication Errors (Warning 32, 60, 61)
These codes indicate issues with communication, either with the display panel or an external battery management system (BMS).
- Check: For Warning 32, reseat the ribbon cable connecting the LCD display. For Warning 60/61, verify the RJ45 cable connection between the lithium battery BMS and the inverter, and confirm the correct protocol (PYL/Lib) is selected in Program 05.
- Fix: Ensure secure connections and correct settings. More details can be found in
/pk/guides/fixes/dyness-bms-alarm-and-cable-pinout-guideor/pk/guides/fixes/pylontech-bms-communication-fault-troubleshooting.
Safety: High Voltage and Battery Hazards
Working with solar inverters and batteries involves significant electrical hazards. Always prioritize safety.
High-Voltage DC Shock Hazard
Solar array open-circuit voltages can reach up to 500VDC on MPPT single-phase Infinity HLE / Axpert models (e.g., Axpert PVS 3KW is 80VDC Max VOC) and up to 1000VDC on three-phase HSC / Infini Plus series. These high DC voltages are lethal and can create persistent electrical arcs.
Internal Capacitor Discharge
Internal high-voltage DC bus capacitors retain dangerous electrical charges even after the inverter is shut down. Technicians must wait at least 5 minutes after isolating PV, battery, and AC grid disconnects before removing chassis covers.
Battery Safety and Equalization Gassing
When working with batteries, especially flooded lead-acid types, wear eye protection. Equalization cycles (Program 30/31 at 29.2 V / 58.4 V) for flooded lead-acid batteries release flammable hydrogen gas; ensure the battery compartment is well-ventilated and free of sparks or flames. Never activate equalization on sealed lithium or gel batteries.
Terminal Connections and Short Circuit Risks
When tightening or disconnecting terminals, always kill power first and use insulated tools. A spanner across a battery bank can short hundreds of amps, causing severe burns and equipment damage. WARNING: The inverter's internal DC bus capacitors retain dangerous electrical charges after shutdown. Wait at least 5 minutes after isolating PV, battery, and AC grid disconnects before removing chassis covers.
When to call a technician instead
While many error codes can be resolved with basic troubleshooting, some situations require professional intervention.
- Persistent Internal Faults: Codes like Fault 08 (Bus voltage is too high), Fault 09 (Bus soft start failed), Fault 53 (Inverter soft start failed), or Fault 57 (Current sensor failed) often indicate internal component failures. These require specialized tools and expertise for diagnosis and repair.
- Repeated Faults: If an error code reappears frequently despite your troubleshooting efforts, it suggests an underlying issue that needs a deeper investigation.
- Warranty Concerns: Attempting unauthorized internal repairs can void your inverter's 1-Year to 2-Year official warranty backed by Tesla Industries.
- Lack of Confidence: If you are unsure about any troubleshooting step, especially those involving electrical measurements or internal components, it is safer to contact an authorized Tesla Industries Pakistan technical service facility in Islamabad, Lahore, or Karachi. For general guidance on when to seek professional help, you can consult
/pk/guides/fixes/when-to-call-a-solar-technician.
Frequently asked questions
What does Tesla inverter Fault 07 mean?
Fault 07 indicates an overload timeout. The connected load exceeds the inverter's rated capacity, typically ≥110% for 5 seconds or 105%–110% for 10 seconds. Reduce connected appliances to clear this fault.
Why is my Tesla inverter showing Fault 02?
Fault 02 signals an over-temperature condition. The internal heatsink, transformer, or power semiconductor temperature has exceeded 100°C. Ensure ≥200mm side and ≥500mm top clearance; clear air intake filters. Before touching the air intake filters, switch the unit off, isolate PV, battery and AC, and wait at least 5 minutes for the internal capacitors to discharge. Reduce heavy continuous loads.
What should I do if my Tesla inverter shows Fault 04?
Fault 04 means the battery voltage is below the low DC cut-off threshold (default 21.0 V for 24 V / 42.0 V for 48 V; adjustable via Program 29, so tubular or lithium setups may cut off at higher voltages). Re-charge the battery from the grid or solar PV, and check for dead cells.
How do I fix a Tesla inverter Fault 56?
Fault 56 indicates that the battery connection is open or disconnected. Switch the inverter off and open the DC battery breaker before touching any terminals, then check all battery cables, terminal lugs, and the battery fuse with insulated tools. **WARNING: The inverter's internal DC bus capacitors retain dangerous electrical charges after shutdown. Wait at least 5 minutes after isolating PV, battery, and AC grid disconnects before removing chassis covers.**
Is Tesla Industries Pakistan related to Tesla Motors?
No, Tesla Industries (Pvt) Ltd is an indigenous Pakistani manufacturer founded in 1992, with no affiliation, corporate relationship, or shared ownership with Tesla, Inc. / Tesla Motors (USA).
References
- Axpert VM IV-4K6K-TWIN Off-Grid Manual — accessed 23 August 2026
- Tesla Infinity HLE 6KW Hybrid Solar Inverter (Retailer) — accessed 23 August 2026
- Tesla Industries (Pvt) Ltd Official Web Portal — accessed 23 August 2026
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