⚠️ Solis Inverter Error Codes — Complete Troubleshooting Guide Pakistan 2026
Complete Solis inverter error code guide for Pakistan: F01–F29 faults, W-series warnings and RHI hybrid-specific battery codes — with Pakistan grid causes, SolisCloud diagnostics and practical fixes.
📋 In this guide
1. How to Read Solis Error Codes
Solis inverters (S5, S6, RHI hybrid, S3, S3-WiFi) display errors on the LCD and in the SolisCloud app. Error categories:
- F codes (Fault): Active faults — inverter stopped or severely limited. Red LED. Requires attention.
- W codes (Warning): Warning conditions — inverter operating with reduced performance or protection active. Yellow LED.
- E codes (Error, older models): Same as F codes on older Solis firmware.
2. Solis F-Series Fault Codes — Pakistan Reference
| Code | Name | Severity | Pakistan Cause | Fix |
|---|---|---|---|---|
| F01 | Grid Overvoltage | Critical | DISCO voltage >253V — very common in Pakistan when grid restores after load-shedding, voltage spike on weak feeders | Self-clears in 30–90 sec. Persistent: ask installer to widen voltage limit via SolisCloud service access or Solis Wi-Fi stick parameter edit. |
| F02 | Grid Undervoltage | Critical | Weak DISCO feeder below 184V — common in older residential areas, heavy industrial feeders | Self-clears. Persistent: report to DISCO. Installer can widen undervoltage threshold. |
| F03 | Grid Overfrequency | Critical | Grid frequency >52Hz — rare Pakistan condition | Self-clears. If frequent: document via SolisCloud and report to DISCO. |
| F04 | Grid Underfrequency | Critical | Grid frequency <47.5Hz — Pakistan grid instability during peak demand | Self-clears. Frequent: DISCO grid quality issue. |
| F05 | Grid Island Protection | Critical | Anti-islanding triggered — occurs during and immediately after load-shedding | Normal behavior. Self-clears 60–90 sec after grid returns. If takes longer: check grid voltage stability at restoration. |
| F09 | PV Overvoltage | Critical | DC string voltage exceeds inverter limit. Occurs on cold Pakistan winter mornings when Voc rises. Wrong string design. | Check string Voc at minimum winter temperature. Reduce panels per string if total Voc × 1.15 exceeds inverter DC input limit. |
| F10 | PV Overcurrent | Critical | DC short circuit, wrong string parallel configuration | Check DC fuses. Inspect all DC cabling. Verify string wiring matches design. Call AEDB electrician. |
| F15 | Ground Fault / Insulation Low | ⛔ STOP | DC cable insulation damaged, MC4 connector water ingress after monsoon, panel frame unearthed | DC isolator OFF immediately. Do NOT restart. Inspect all DC cabling and MC4 connectors. Check panel frame earthing. Call AEDB electrician. |
| F20 | Inverter Overtemperature | Critical | Inverter location in direct sun or poorly ventilated space — Pakistan summer ambient >45°C, inverter room >55°C | Add shade to inverter location. Improve ventilation. Clean fan (model-dependent). Ensure 20cm+ clearance on all sides. |
| F22 | Fan Fault | Warning | Fan blocked by Pakistan dust (quarterly accumulation), bearing failure | Turn off inverter. Clean fan with compressed air. Replace fan if bearing has failed — available from Solis Pakistan distributor. |
| F23 | DSP Communication Fault | Critical | Firmware issue, internal board communication failure, power surge damage | Power cycle. If persists: firmware reflash may be needed by authorized dealer. Warranty claim if within 5 years. |
| F29 | Relay Check Fault | Critical | AC relay failure — power surge damage common in Pakistan | Power cycle. If persists: relay replacement needed — warranty claim through Solis Pakistan distributor. |
3. Solis W-Series Warning Codes
| Code | Name | Pakistan Cause | Action |
|---|---|---|---|
| W01 | Grid Voltage High Warning | Grid 230–253V — slightly elevated but within limit | Inverter de-rating output. Monitor — if persistent daily, report to DISCO. |
| W02 | Grid Voltage Low Warning | Weak DISCO feeder 184–207V | Inverter reducing power. Report persistent low voltage to DISCO. |
| W07 | PV Voltage High Warning | String voltage near upper limit — cold morning startup | Usually self-resolves as temperature rises. Monitor — persistent: check string Voc calculation. |
| W09 | Temperature Warning | Inverter above 60°C — Pakistan June–August peak heat | Inverter throttling output. Add shade and ventilation urgently before E20 fault triggers. |
| W11 | Meter Communication Error | Export meter disconnected or communication fault (net metering setups) | Check RS485 cable between Solis inverter and export meter. Reseat connectors. Verify meter address settings match. |
4. Solis RHI Hybrid-Specific Codes
| Code | Name | Cause | Fix |
|---|---|---|---|
| Bat F01 | Battery Overvoltage | Battery charged above protection threshold — wrong battery type setting, BMS communication failure | Check battery type parameter in Solis settings matches actual battery (LiFePO4 vs lead-acid). Verify CAN bus cable connection. Power cycle battery then inverter. |
| Bat F02 | Battery Undervoltage | Battery discharged below protection threshold — BMS has disconnected battery | Allow solar to charge during next sunny day. If battery deeply discharged: Pylontech/BYD may need recovery procedure — contact battery distributor. |
| Bat F05 | Battery Communication Fault | CAN bus cable loose, wrong protocol selected, battery not powered on before inverter | (1) Battery OFF, Inverter OFF. (2) Reseat CAN bus cable both ends. (3) Power ON battery first, wait 30 sec, then power ON inverter. (4) Check Solis "Battery Brand" parameter matches your actual battery brand. |
| Bat F07 | Battery Overtemperature | Battery in hot location — Pakistan summer battery room >45°C | Relocate battery to cooler, ventilated location. LiFePO4 BMS disconnects above 55°C operating temp. Shade and ventilation essential. |
| Gen Fault | Generator Input Fault | Generator voltage/frequency unstable, generator <3kVA, no AVR | Solis RHI supports generator input. Use minimum 3kVA diesel generator with AVR. Warm up 3 minutes before connecting. Petrol generators often fail voltage stability requirements. |
| Off-Grid F | Off-Grid Mode Fault | Load exceeds inverter capacity in off-grid mode, battery SoC too low for off-grid | Check load does not exceed Solis RHI rated output. Ensure battery SoC above 20% before enabling off-grid mode. Reduce load during battery-only operation. |
5. Most Common Solis Problems in Pakistan
🔴 F01 Grid Overvoltage — Every Load-Shedding Restoration
Pakistan's most common Solis problem. DISCO voltage spikes above 253V when power returns after load-shedding. Solis self-clears in 30–90 seconds — but if it's taking 5+ minutes, ask your installer to widen voltage tolerance via SolisCloud service access.
🔴 Bat F05 Battery Communication — Hybrid Systems
Most common Solis RHI hybrid issue in Pakistan. 95% of cases are CAN bus cable problems, not hardware failure. Follow this sequence exactly: (1) Both devices completely off. (2) Unplug CAN bus, wait 30 seconds, reseat firmly. (3) Battery ON first, wait 30 seconds. (4) Inverter ON. (5) Check SolisCloud — battery SoC should appear within 2 minutes. If still failing: verify "Battery Brand" parameter in Solis settings matches your actual battery (Pylontech = "Pylontech", not "Auto").
🟡 SolisCloud Not Updating
Solis SolisCloud monitoring is less reliable than GoodWe SEMS — server outages and delayed data are more frequent. If SolisCloud shows no data: (1) Check inverter WiFi dongle LED (blue = connected). (2) Try SolisCloud refresh or log out and log in. (3) Check WiFi password hasn't changed. (4) Restart WiFi dongle by unplugging and reconnecting. SolisCloud server reliability has improved in 2025–2026 but occasional outages still occur.
🟢 Solis RHI Off-Grid Mode Tips
Solis RHI off-grid capability is unique — it can operate completely independent of grid. Activate in Solis settings: Battery → Off-Grid Mode → Enable. Important Pakistan tips: ensure battery is charged above 30% before entering off-grid mode; don't run heavy loads (multiple ACs) in off-grid — the output power limit is the inverter's rated kW; off-grid mode with generator input = best Pakistan rural solution.
Frequently Asked Questions
Pehle LCD screen pe error code dekho. Phir: DC isolator band karo, AC breaker band karo, 3 minute ruko. Phir AC on, phir DC on. Agar F15 code hai: bilkul mat chalao — AEDB electrician bulao. Agar F01/F02 hai (grid voltage): aksar khud theek ho jata hai 60–90 second mein grid stable honay ke baad. Agar W09 temperature warning hai: inverter ko dhoop se door karo aur ventilation barhaao.
- Battery aur inverter dono completely band karo
- CAN bus cable unplug karo, 30 second ruko, firmly reseat karo dono sides pe
- Battery pehle on karo, 30 second ruko
- Phir inverter on karo
- Solis settings mein check karo: "Battery Brand" parameter aapki actual battery brand se match karta hai? (Pylontech = "Pylontech")
- Check karo CAN bus cable protocol — Solis RHI ke liye CAN hai, RS485 nahi
Access Solis inverter settings via the front panel buttons or SolisCloud app (with installer credentials): Advanced Settings → Battery → Off-Grid Mode → Enable. Requirements: battery must be at least 20–30% SoC to enter off-grid mode; load must not exceed inverter rated power; re-enables automatically when grid returns if set to "Auto" mode. Off-grid mode with generator input is ideal for extended Pakistan load-shedding — charge battery from generator when solar is insufficient.
Warranty claim process: (1) Note exact error code from LCD and SolisCloud event log. (2) Export SolisCloud fault history as PDF. (3) Note inverter serial number (back panel). (4) Contact your Solis authorized dealer in Pakistan with: serial number, error code, installation date, fault log PDF, photos of installation. (5) Solis standard warranty is 5 years, extendable to 10 years. Claims processed through local Solis Pakistan distributor — typically 1–3 weeks for assessment and replacement decision.
Yes — Solis S5/S6 on-grid and Solis RHI hybrid are NEPRA-approved for net metering across all Pakistani DISCOs. Solis RHI provides the best budget hybrid option with generator input — essential for Pakistan's extended load-shedding. The 30ms switching (vs GoodWe's 20ms) is adequate for most home loads. SolisCloud monitoring is functional but less reliable than GoodWe SEMS. Overall Solis is a strong choice for budget-conscious buyers wanting hybrid functionality.
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