Solar Booster Pump Controller Fault Code List: Professional Decode Manual for Technicians
Last Updated: August 2026 | Reviewed by: Jingong Pump Engineering Team | Reading time: ~12 min | Best for: Local pump technicians, irrigation engineers, overseas distributors, mining & agricultural end-users
As a dedicated Solar Booster Pump manufacturer, Jingong has compiled this field-tested fault code reference after years of serving thousands of overseas technicians across agricultural, industrial, and commercial solar pumping projects. This Solar Booster Pump manufacturer manual covers universal controller error decoding for solar water pumps, submersible pumps, surface pumps, and gasoline/diesel engine-driven pumps. Every code, cause, and fix below comes from real on-site repair cases handled by our engineering team — not generic theory.
Whether you are an independent Solar Booster Pump manufacturer distributor’s service engineer or a local contractor repairing a solar booster pump controller on a remote farm, this page is built to help you decode → diagnose → fix within minutes.
Why Trust This Fault Code Manual?
Jingong is a vertically integrated Solar Booster Pump manufacturer based in Zhejiang, China. We operate as both factory and trading entity, producing solar booster pumps, submersible pumps, surface/land pumps, and gasoline/diesel pumps for global B2B markets. Our controllers are deployed in over 60 countries across agriculture irrigation, mining dewatering, rural water supply, and commercial boosting systems.
✅ 15+ years of pump controller R&D and field failure data collection
✅ 99% of outdoor, agricultural, and industrial solar pump controller faults covered
✅ Compatible with DC/AC solar pump controllers, intelligent universal pump controllers
✅ Authored by front-line service engineers, not content writers
As your long-term Solar Booster Pump manufacturer partner, we update this manual continuously with new fault patterns reported from overseas job sites. If you are an overseas distributor or technician seeking authorized Solar Booster Pump manufacturer support, bookmark this page and contact our engineering desk.
Understanding Your Solar Booster Pump Controller
Before diving into the fault code table, every professional Solar Booster Pump manufacturer technician should understand the four core reasons why a solar booster pump controller triggers an error:
| Trigger Category | What Happens Inside the Controller |
|---|---|
| Voltage Abnormalities | PV input too high/low, DC bus under-voltage, grid fluctuation, unstable solar array output |
| Load & Motor Faults | Over-current during accel/decel/constant speed, motor overload, dry-run, blocking |
| Thermal Protection | Controller heat-sink overheat, motor winding over-temperature, ambient temperature exceedance |
| System & Signal Errors | Wiring mistakes, sensor failure, communication loss, EEPROM fault, water-level probe error |
A reliable Solar Booster Pump manufacturer always designs controllers with self-diagnostic capability. The error code displayed is your fastest path to root-cause identification — if you know how to read it correctly. For Jingong solar pump products, the same logic applies across our submersible, surface, and fuel pump controller families.
Full Solar Booster Pump Controller Fault Code List
The following table is the core reference used by Jingong — a leading Solar Booster Pump manufacturer — in our global technical support operations. Codes are grouped by fault family. While exact code numbers vary slightly between controller models, the fault families and repair logic remain consistent across all major Solar Booster Pump manufacturer product lines.
🔋 Group A: Power Supply & Voltage Faults
| Code | Display Message | Applicable Pump | Root Cause | On-Site Fix |
|---|---|---|---|---|
| Er007 / E-07 | Acceleration Over-voltage | Solar / Surface | Input voltage too high, no braking unit, accel time too short | Adjust voltage to normal range, increase accel time, install braking resistor |
| Er009 / E-09 | Constant-speed Over-voltage | Solar / Submersible | Abnormal PV input, external dragging force | Check PV array, cancel external load, install braking unit |
| Er010 / E-07 | DC Bus Under-voltage | All types | Instantaneous power failure, input voltage out of limit, rectifier bridge fault | Reset fault, adjust voltage, seek technical support if persistent |
| SLP / A.SLP | Sleep Mode (Low Light) | Solar only | Insufficient solar irradiance, PV power < 1.3× pump rating | Increase PV array size, check DC Vmp, raise PE-04/PE-05 threshold |
⚙️ Group B: Motor, Load & Pump Body Faults
| Code | Display Message | Applicable Pump | Root Cause | On-Site Fix |
|---|---|---|---|---|
| Er001 / E-01 | Acceleration Over-current | All types | Motor ground short, no auto-tuning, accel too fast, low voltage, undersized controller | Perform motor ID auto-tuning, increase accel time, use higher-rated controller |
| Er002 / E-02 | Deceleration Over-current | All types | Output short, no auto-tuning, decel too fast, sudden load | Auto-tune motor, increase decel time, install braking resistor |
| Er003 / E-03 | Constant-speed Over-current | Submersible / Fuel | Output short, sudden load change, undersized inverter | Exclude external fault, cancel sudden load, upsize controller |
| Er010 / Er.oL1 | Inverter Overload | All types | Load too big, motor blocked, controller undersized | Reduce mechanical load, check for jam, select larger capacity |
| Er011 | Motor Overload | Solar / Submersible | Input voltage low, controller rating insufficient | Check power supply, replace with higher-rated controller |
| A.LLd / Dry | Dry-run / Under-load | Submersible only | Water source depleted, intake clogged, pump depth too high | Verify water level, clean intake screen, adjust PE-22 to disable if needed |
🌡️ Group C: Thermal & Overheat Protection
| Code | Display Message | Applicable Pump | Root Cause | On-Site Fix |
|---|---|---|---|---|
| Er015 / E-08 | Controller Overheat | All types | Air duct blocked, ambient > 50°C, cooling fan failed | Clear ventilation, add shade, replace fan, derate controller |
| Er034 | Motor Overheat | Submersible / Fuel | Prolonged overload, poor heat dissipation in deep well, fuel engine mismatch | Stop pump, allow cool-down, check load, verify motor spec match |
🔌 Group D: Wiring, Signal & System Faults
| Code | Display Message | Applicable Pump | Root Cause | On-Site Fix |
|---|---|---|---|---|
| Er013 | Input Open-phase | Surface / Fuel (AC) | Loose grid wiring, contactor failure | Tighten terminals, check contactor, verify 3-phase balance |
| Er014 | Output Open-phase | All types | Motor terminal loose, U/V/W wiring broken | Re-terminate motor leads, check cable integrity |
| Er017 | External Input Fault | Solar / Submersible | Water-level sensor broken, float switch miswired | Check sensor continuity, verify PE-35 setting, repair wiring |
| Er018 | Communication Fault | Smart controllers | RS485/Modbus cable damaged, baud rate mismatch | Check comm wiring, verify protocol settings, replace cable |
| Er024 | Motor Ground Circuit Fault | Submersible only | Cable insulation breakdown underwater, motor phase-to-ground | Pull pump, Megger-test windings, replace cable section |
| Er021 | EEPROM Version Incompatible | All types | Firmware mismatch, parameter memory corrupted | Seek technical support, re-flash firmware via authorized Solar Booster Pump manufacturer |
📌 Note: As a professional Solar Booster Pump manufacturer, Jingong recommends verifying exact code definitions against your specific controller nameplate and user manual. Different controller generations may shift code numbering. For Jingong solar booster pump controllers, the latest manuals are available from our technical support desk.
Pump Category-Specific Fault Patterns
Different pump architectures fail differently. A seasoned Solar Booster Pump manufacturer understands these nuances. Below is how fault manifestation varies across the four main pump families we produce.
☀️ Solar Water Pumps — Solar-Specific Faults
- A.SLP (Sleep Mode): Triggered when PV power drops below 1.3× pump rating. Common at dawn/dusk or heavily overcast days.
- A.LFr (Low Frequency): Output frequency falls below PE-19 threshold — typically indicates pump is unloaded or water source near depletion.
- Weak Light Start Failure: P30.23/P30.24 parameters misconfigured; pump fails to auto-restart after cloud cover.
- MPPT Vmpp Mismatch: PV array Vmpp not aligned with controller MPPT window (P30.14). Causes chronic under-performance, not hard fault.
🌊 Submersible Pumps — Underwater-Specific Faults
- Dry-run (A.LLd): The #1 cause of submersible motor burnout. Always wire a water-level sensor.
- Er024 Ground Fault: Cable insulation compromise underwater. Requires pull-out and Megger test (≥500 MΩ at 1000V DC).
- Deep-well Head Loss: Static water level drop during drought triggers repeated under-load alarms.
💧 Surface / Land Pumps — Above-Ground-Specific Faults
- Priming Failure: Pump runs but no water — air lock in suction line. Not a controller fault, but mimics E03.
- Intake Leak: Loose suction fitting draws air, causing cavitation-like noise and false over-current trips.
- Grid Voltage Sag: Rural locations with weak grid suffer chronic Er007/Er009 during compressor/refrigerator startup.
⛽ Gasoline & Diesel Pumps — Engine-Driven-Specific Faults
- Engine-Controller Sync Loss: Throttle actuator signal mismatch triggers Er018-style comm faults.
- Battery Charging Fault: Auxiliary charging controller fails → battery depletes → controller resets randomly (mimics Er010).
- Fuel Pump Relay Sticking: Causes controller to detect “false run” — requires relay replacement, not controller replacement.
3-Minute Field Troubleshooting Flow for Technicians
- Read the code — note exact digits, flashing pattern, and whether it’s “E” or “Er” prefix. A professional Solar Booster Pump manufacturer labels codes consistently per controller generation.
- Check PV/grid input — measure DC bus voltage at controller terminals. Is it within nameplate range?
- Inspect water source — for submersible pumps, confirm water level is above pump intake by ≥1 meter.
- Verify wiring — U/V/W to motor, PV+/PV− polarity, ground continuity. Look for burn marks or loose lugs.
- Reset & observe — power-cycle controller. If fault recurs immediately → hardware issue. If after 10 min → thermal/load issue.
- Consult this table — match code to root cause, apply on-site fix. For Jingong controllers, our engineering team is reachable for distributor-level escalation.
Preventive Maintenance by Pump Category
| Pump Type | Key Maintenance Actions | Recommended Interval |
|---|---|---|
| Solar Booster | Clean PV panels, check MC4 connectors for corrosion, verify MPPT efficiency | Panels: monthly / Connectors: quarterly |
| Submersible | Megger test cable, inspect water-level sensor, check drop pipe for scaling | Every 6 months |
| Surface | Prime check, foot valve inspection, suction line leak test | Monthly |
| Gasoline/Diesel | Fuel filter, spark plug/Injector, battery health, controller firmware | Per engine hours (typically 100h) |
As your Solar Booster Pump manufacturer, Jingong provides detailed maintenance guides for each pump category. Distributors receive seasonal maintenance checklists localized for their climate zone.
Frequently Asked Questions
Q1: Why does my solar booster pump controller keep showing errors even after reset?
A: Recurring faults after reset indicate a persistent hardware issue — most commonly PV under-power (controller enters SLP repeatedly), water source depletion (dry-run), or motor/controller mismatch. Measure PV open-circuit voltage at noon; it must exceed controller max input by ≤20%. If PV is healthy, the issue is likely pump-side. Contact your Solar Booster Pump manufacturer support with the exact fault sequence recorded.
Q2: How do I reset a solar pump controller fault code?
A: Most controllers reset via one of three methods: (1) Power-cycle — disconnect PV input for 30 seconds, reconnect; (2) Press & hold the “STOP/RESET” button for 3-5 seconds; (3) Via parameter menu, navigate to fault reset (often P14.00 or similar). Note: reset only clears the latch — if root cause persists, the code will return within minutes.
Q3: Is a faulty pump controller repairable or must it be replaced?
A: It depends on the fault. Er001–Er009 (over-current/voltage) are almost always external — the controller itself is fine. Er015 (overheat) often just needs fan replacement. However, Er021 (EEPROM corruption), module-level failures (Er098 distributor runtime), or physical PCB burn marks typically require controller replacement. A qualified Solar Booster Pump manufacturer can diagnose via remote fault log review. Jingong offers controller-level repair services for distributors.
Q4: What’s the difference between submersible and surface pump fault codes?
A: Submersible pumps uniquely trigger dry-run (A.LLd) and ground fault (Er024) due to underwater operation. Surface pumps more frequently show priming-related false trips and grid voltage sag faults. Both share the universal Er001–Er018 code families. Detailed differences are documented in our submersible pump and surface pump dedicated fault manuals.
Technical Support & Expert Service
As your trusted Solar Booster Pump manufacturer, Jingong not only delivers high-quality pumping products but also provides comprehensive technical support for global distributors and technical teams. If you encounter an unresolved fault during troubleshooting, or need detailed wiring diagrams and parameter setting guides for specific models, please contact us anytime. We offer:
- ✅ Remote fault log analysis (controller model & fault code sequence required)
- ✅ Distributor-level after-sales training and technical document sharing
- ✅ Controller repair and replacement services (for authorized distributors)
- ✅ Customized solar pumping system solutions
Choose Jingong — choose a Solar Booster Pump manufacturer that truly understands the product, the field, and your service needs. Explore our Solar Water Pump Center, Submersible Pump Series, Surface Pump Series, or Gasoline & Diesel Pump Series for more professional equipment.
Ready to partner with a proven Solar Booster Pump manufacturer?
📧 Email: [email protected]
💬 WhatsApp: +86 15888920959
🌐 Explore: Solar Water Pump | Submersible Pump | Surface Pump | Diesel Gasoline Pump
This page is authored by Jingong Technology’s engineering team as a Solar Booster Pump manufacturer.
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