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Comprehensive Diagnostics Center

Solar PV Fault Finding & Maintenance Guide

Identify faults, decode error codes, and maintain your system efficiently.

CRITICAL SAFETY WARNING

SOLAR PV SYSTEMS GENERATE LETHAL HIGH-VOLTAGE DC ELECTRICITY (UP TO 1000V).

  • VISUAL EXAMINATION ONLY: Never attempt to remove inverter covers, unscrew terminals, or touch exposed cables.
  • DO NOT TOUCH: Damaged cables, wet isolators, or burnt connectors.
  • RISK OF ARCING: DC electricity can arc (jump) through the air. Keep your distance from damaged equipment.

This guide is for diagnostic purposes (reading screens/lights) only. If you suspect a hardware fault, STOP and contact a professional immediately.

1. Check Generation Meter

Located near fuse box.

Note the LED pattern (meters differ)
Do not assume solid = fault — check the meter label

2. Check Inverter Display

Located in loft/garage.

Green often means generating (confirm in your manual)
Red/amber often means fault or standby — read the code

3. Check Bills

Verify reading consistency.

Compare meter to bill
Sudden cost spike?

Universal Warning Lights Guide

2010-Era Inverter Faults Overview

Specific guidance for aging systems (Installed 2010-2015).

Inverter Brand Fault Codes

Select your inverter manufacturer to see specific error codes and fixes.

Maintenance & Parts Guide

Reset only for your make (with the fault code)

1. Identify make/modelRead the label on the inverter cabinet
2. Note exact fault codePhoto of the display helps
3. Use make-specific stepsSolaX, Fox ESS or Growatt manuals
4. SolaX / Fox / GrowattFollow that model's published restart only
5. Call if code returnsBook a diagnostic if it returns

Diagnostic FAQs

Need Help?

Tell us the inverter make, model and the exact fault code on the screen (photo helps). Generic five-step resets are unsafe to follow blindly — DC isolators and sequences differ. SolaX: use the power-cycle sequence in your SolaX user manual for that model (AC off → DC off → wait → DC on → AC on) only after noting the code. Fox ESS: follow the Fox ESS user manual restart for your model; keep the fault code. Growatt: follow the Growatt OEM restart in the manual for your series. If the code returns, stop and book a diagnostic — we diagnose and replace; we do not leave unsafe DIY work mid-sequence.

Book a Diagnostic

Expert engineers available in Birmingham & West Midlands.

Contact Support

Troubleshooting Flow

1. Check Lights
2. Note Error Code
3. Check make manual
4. Call if persists

Quick Resources