- Solar and energy
- Solar inverter
IE:00020
SolaX IE:00020 IsoFault on solar inverter: PV insulation fault
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
SolaX code IE:00020 IsoFault means an isolation fault: the inverter has found that the panels or their wiring have too little insulation to earth. Do not touch panels or cables, and ask the installer to measure the insulation.
Safety first
Stop and check this first
- With an isolation fault, cables and frames may be live: do not touch panels, connectors or the inverter, and remember that the panels generate voltage whenever there is daylight.
Safe checks you can perform
- Check the code and the red indicator
- Look over cables and panels from a distance
- Call the installer and leave the unit as it is
Leave these tasks to a qualified professional
- Do not attempt this professional task: Connection and inverter earth inspection
- Do not attempt this professional task: Insulation test on each string
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Connection and inverter earth inspection
What they doThe technician inspects the DC connectors, the earth cable and the port sealing of the inverter, as SolaX describes in troubleshooting and maintenance.
They must show youthe condition of the connectors, continuity of the earth cable and the inverter fault log.
In writingwhich connection was corrected and the test results after start-up.
Insulation test on each string
What they doThe installer measures the insulation resistance to earth of every PV string connected to the SolaX to find the faulty section.
They must show youthe insulation resistance of each string against the 20 kΩ threshold the manual cites, and each string's voltage.
In writingthe measured values and which connector, cable or module was replaced.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Check the code and the red indicator
- Who:
- you, looking at the LCD and the inverter lights without opening anything.
- How:
- confirm that it reads IsoFault or IE:00020 and that the red error light is on or flickering; write down the time and whether it had rained.
- Result that matters:
- knowing it is the isolation fault and not a grid or temperature code.
- If IsoFault shows with the red light:
- the inverter has detected low insulation; carry on with the next steps.
- If the screen shows an IE number other than 00020:
- look up its row in the manual's fault table.
- Evidence to keep:
- a photo of the display and indicators with date and time.
Evidence: X1-BOOST G4 Series User Manual Version 6.0
Look over cables and panels from a distance
- Who:
- you, from the ground or a safe spot, without climbing onto the roof or touching anything.
- How:
- look for panel cables hanging loose, chewed, with split sheathing or sitting in water, and note whether the fault began after rain or panel cleaning.
- Result that matters:
- giving the installer visible clues about where the insulation defect may be.
- If you see damage or water:
- keep away and report it to the installer with photos taken from a distance.
- If nothing looks wrong:
- the defect may be in a connector or inside a module; the installer will locate it.
- Evidence to keep:
- distance photos of cables and panels and a note of the weather.
Evidence: X1-BOOST G4 Series User Manual Version 6.0
Call the installer and leave the unit as it is
- Who:
- you, without opening the inverter or unplugging DC connectors.
- How:
- SolaX warns never to handle mains or PV cables with power applied and to wait at least 5 minutes after disconnection; panels keep generating in daylight, so the checks belong to the installer.
- Result that matters:
- a professional measuring the insulation with no risk to anyone in the household.
- If the installer can visit the same day:
- change nothing so they see the active fault.
- If you notice a burning smell, sparks or heat:
- switch off at the AC breaker if safe and report it urgently.
- Evidence to keep:
- the time you called the installer and photos of the display.
Evidence: X1-BOOST G4 Series User Manual Version 6.0
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Solar and energy
- Brand
- SolaX Power
- Product type
- Solar inverter
Known code variants
- inversor SolaX fallo aislamiento
- SolaX IE 20
- SolaX IE:00020 fallo de aislamiento
- SolaX insulation fault
- SolaX IsoFault
- SolaX Isolation Fault
- SolaX luz roja IsoFault
- SolaX X1 Boost G4 IE:00020
- SolaX X1-Boost IsoFault
What it means
In the SolaX X1-BOOST G4 user manual (Version 6.0, April 2024), IE:00020 IsoFault is 'Isolation Fault', and the official solution is to check the inverter connections or consult SolaX. For Australia and New Zealand the manual explains that the red light flickers and IsoFault shows on the LCD once the insulation impedance of the PV arrays is below 20 kΩ. The code on its own never proves which cable or module is at fault, and other models or firmware may number it differently.
Warnings and stop conditions
- Highsource verified
With an isolation fault, cables and frames may be live: do not touch panels, connectors or the inverter, and remember that the panels generate voltage whenever there is daylight.
Evidence: X1-BOOST G4 Series User Manual Version 6.0
Symptoms and causes
Probable causes · in order
- PV insulation below the thresholdCommon
The X1-BOOST G4 manual links IsoFault to a PV array insulation impedance below 20 kΩ in the version for Australia and New Zealand.
Evidence: X1-BOOST G4 Series User Manual Version 6.0
- Faulty inverter connectionsPossible
SolaX's fault table says to check the inverter connections for IsoFault, so a poorly made DC connector or cable is a suspect.
Evidence: X1-BOOST G4 Series User Manual Version 6.0
- Earth cable not properly connectedLess common
In its maintenance section SolaX reminds that the ground terminal and cable must be secure and the ports sealed, which affects insulation readings.
Evidence: X1-BOOST G4 Series User Manual Version 6.0
Virtual technician
Does IE:00020 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
X1-BOOST G4 Series User Manual Version 6.0
SolaX Power Network Technology (Zhejiang) Co. Ltd. · 2024 · manual
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