- Solar and energy
- Solar inverter
106
Fronius inverter event 106
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
High
Quick answer
Fronius defines event 106 as: AC grid frequency is too low. The useful next discriminator is grid frequency, event time and whether other equipment lost supply. Preserve the event before any reset.
Safety first
Stop and check this first
- Do not change grid-code, voltage or frequency protection settings without installer and grid-operator authorization. Do not measure live boards yourself.
Safe checks you can perform
- Preserve the exact event context
- Collect one safe discriminator
- Respect the electrical stop point
Leave these tasks to a qualified professional
- Do not attempt this professional task: Measured handoff for Fronius 106
What a technician must be able to justify
A technician is coming
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.
Measured handoff for Fronius 106
What they doA qualified electrician should log phase voltages, frequency and connection-point impedance under the same export condition, then compare them with the active grid code and utility limits.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Checks and evidence, step by step
Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
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Preserve the exact event context
No special tools
Procedure
Save event 106, timestamp, inverter model/serial, firmware, red-LED state, affected phase/string, power and weather before clearing anything.
Do not change grid-code, voltage or frequency protection settings without installer and grid-operator authorization. Do not measure live boards yourself.
Evidence: Fronius Symo / Eco status diagnostics
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Collect one safe discriminator
No special tools
Procedure
From the monitoring interface and a safe location, note whether other premises lost power and whether the event repeats at a particular export level or time. Record grid frequency, event time and whether other equipment lost supply; do not change multiple parameters or circuits at once.
Do not change grid-code, voltage or frequency protection settings without installer and grid-operator authorization. Do not measure live boards yourself.
Evidence: Fronius Symo / Eco status diagnostics
- 3
Respect the electrical stop point
No special tools
Procedure
If supply to the site is abnormal, involve the grid operator; if only the inverter repeats the event, a qualified electrician must measure at the connection point.
Do not change grid-code, voltage or frequency protection settings without installer and grid-operator authorization. Do not measure live boards yourself.
Evidence: Fronius Symo / Eco status diagnostics
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Solar and energy
- Brand
- Fronius
- Product type
- Solar inverter
Known code variants
- cargador Wallbox 106
- caricatore Wallbox 106
- chargeur Wallbox 106
- code Wallbox 106
- codice Wallbox 106
- código Wallbox 106
- erreur Wallbox 106
- error Wallbox 106
- errore Wallbox 106
- événement Fronius 106
- evento Fronius 106
- Fronius Ereignis 106
- Fronius event 106
- Fronius inverter 106
- Fronius Symo / Eco 106
- Fronius Wechselrichter 106
- inversor Fronius 106
- inverter Fronius 106
- onduleur Fronius 106
- Wallbox app code 106
- Wallbox charger 106
- Wallbox error 106
- Wallbox Fehler 106
- Wallbox Fehlercode 106
- Wallbox Ladegerät 106
What it means
Official meaning: AC grid frequency is too low. Decision boundary: capture grid frequency, event time and whether other equipment lost supply. A qualified electrician should log phase voltages, frequency and connection-point impedance under the same export condition, then compare them with the active grid code and utility limits.
Warnings and stop conditions
- Mediumsource verified
Do not change grid-code, voltage or frequency protection settings without installer and grid-operator authorization. Do not measure live boards yourself.
Evidence: Fronius Symo / Eco status diagnostics
Symptoms and causes
Probable causes · in order
- What the Fronius event establishesConfirmed
The official Fronius Symo / Eco manual defines event 106: AC grid frequency is too low.
Evidence: Fronius Symo / Eco status diagnostics
- The observation that changes the next branchPossible
Capture grid frequency, event time and whether other equipment lost supply. If supply to the site is abnormal, involve the grid operator; if only the inverter repeats the event, a qualified electrician must measure at the connection point.
Evidence: Fronius Symo / Eco status diagnostics
Virtual technician
Does 106 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
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Fronius Symo / Eco status diagnostics
Fronius International GmbH · 2025 · official_doc
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