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Fronius IG / IG Plus Solar Inverter Faults and Repairs

Austrian inverter manufacturer Fronius began manufacturing inverters in 1994 and are widely regarded as one of the best manufacturers of quality solar PV inverters in the world. Common models installed in the UK are the IG15, IG20, IG30, the IG Plus 35 V-1, the IG-TL 3.0 and the IG-TL 3.6.

We have a lot of experience in working with Fronius equipment, so if you would like help with diagnosing faults, carrying out servicing or repairs and are currently without an installer then we will be happy to help.

Fronius IG and IG Plus series inverters have LCD displays on the front of the chassis that providing it's working, will highlight any errors with the inverter or the solar PV system that it runs, we have listed and described common faults with Fronius LG and LG Plus Series inverters and what action to take to resolve them below:

NB: "State 104 - Grid Frequency is Beyond Permitted limits" This code is a fairly common fault code, in addition to the explanation given by Fronius in relation to grid frequencies below, this fault is often an indication of a faulty or a damaged circuit board within the inverter. Usually but not always, when a circuit board is damaged like this, the Miniature Circuit Breaker (MCB) protecting the AC circuit would also have switched itself 'Off'. Depending on the warranty situation and the age, when this State code is present and persists after the mains and the supply circuit has been tested, we usually recommend that the inverter is replaced.

All Solar Inverter Faults and Repairs

Solar Power System Repairs

Repair Fronius IG Plus Series Inverter

Fronius IG and IG Plus Solar Inverter LED Indicators:

  • Green Light - The green LED indicates that the inverter is operating correctly.

  • Orange Light - The orange LED indicates that the inverter is going through its startup sequence or in standby.

  • Red Light - The red LED indicates that the inverter has detected a fault condition. A fault description will appear on the display.

Fronius IG and IG Plus Solar Inverter Faults and Warnings:

Some of the advice we give related to identifying, confirming and or resolving some of the faults detailed below, starts with safely shutting down and restarting the inverter and the solar PV system. This is something that nearly all solar PV systems installed in the UK would have been designed to be carried out safely by the solar PV system owner. However, paperwork, schematics and manuals are not always clear or available, so if you have any concerns about how to do this, we will always be more than happy to talk you through the process over the telephone at no charge.

How to Restart Fronius IG and IG Plus Solar Inverters:

Leave everything near the supply meters turned on. At the inverter there will be an AC isolator, this is used to isolate the mains/grid supply from the inverter and to prevent the inverter from feeding solar power into the electrical system. Switch the AC isolator 'off', if the inverter is running correctly you will hear a clunk inside the machine and after a while a 'no-grid', 'missing grid' warning or similar on the LCD display.

Solar PV System Restart

Repair Fronius IG Series Inverter

Near to and or built into the solar inverter will be a method of isolating the solar (DC) supply from the inverter. Often these are black and grey and will be labelled 'DC isolator' or similar. There might be two or more of these if the system is fed by multiple strings. If there isn't a seperate DC isolation device, there will be a way to isolate the DC supply built-in to the inverter itself (often a rotary style switch underneath), turn this 'off'.

When all of the lights on the solar inverter have gone out, reintroduce the AC/mains supply by turning the AC isolator 'on'. Introduce the DC supply by turning all DC isolators 'on'.

This will restart the solar inverter, on the display it might show you progress during it's startup procedure. During startup is when the solar inverter carries out all of the tests needed before being able to connect the solar supply to the electrical system. If errors are found during testing they will be displayed on the screen or an indication light might come on. Make a note of any warning messages, warning lights and fault codes.

If the restart is succesful a green light will come on, sometimes flashing at first but once connected to the mains/AC supply remaining permenantly on. The LCD display will show how much power the solar PV system is generating. The solar PV system can be verified as working at the solar generation / Feed in Tariff (FIT) meter which will count on the display, the red light will pulse as it counts.

Fronius IG and IG Plus Solar Inverters: No lights, No Display

Fronius IG and IG Plus solar inverters are powered by the solar panels (the DC supply) and will startup at sunrise each day and shutdown at night. If you find the inverter with no lights or display working during the day, there is either a problem with the solar panels or with the inverter. Follow the shutdown and restart procedure outlined above and if the problem persists Contact us to discuss the next steps.

Fronius IG and IG Plus Solar Inverter Fault Codes and Explanations:

Solar Power System Repairs

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Solar Inverter Recycling: - Recycling Fronius Inverters

Fronius inverters contain valuable materials such as copper and aluminium, these materials are in high demand and recycling them is significantly less energy intensive than extracting them from ore.

If you find yourself with a damaged or faulty Fronius inverter, we will be pleased to help you recycle it.

Solar Power System Repairs

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Solar Power System Testing, Servicing & Maintenance

Regular solar PV system testing, servicing and maintenance will extend the life of a solar PV system and ensure that solar panels are always operating safely and at their best, whilst maximising yields.

We offer complete safety and performance testing for solar PV power systems of any size. Includes solar panels, cables, inverters, isolators and mains connections.

We provide solar power system testing and maintenance services for residential, commercial, industrial and agricultural clients across Southern, South West England and the West Midlands, with specialist experience working with farmers, developers and commercial and industrial buildings owners.

Solar Power System Testing, Servicing & Maintenance

 

Solar PV Inverter Replacement

If you have a faulty inverter, we offer an efficient, value for money, hassle free inverter replacement service. We offer good advice and install quality equipment with comprehensive warranty and support options. We will test the rest of the system as part of the service, take care of all hardware deliveries, record the new unit's serial number and confirm the warranty details with the manufacturer.

Our engineers work cleanly and will dispose of any unwanted boxes, faulty equipment and packaging.

Many modern inverters can now use wireless home networks to transmit solar generation data to PCs, tablets and smartphones, so if you would like something like this, let us know and we will be happy to set it up as part of the installation.

Solar PV Inverter Replacement

 

Mains/Grid Isolation and Surge Protection

Mains/AC Surge Protection Solar PV Systems

A whole house surge protector is installed to provide protection from transient overvoltages originating from the mains/grid. A whole house surge protector is installed directly inline and as close as possible to the incoming mains/grid supply meter, this allows for surge protection for all circuits and equipment including solar inverters, routers, stereos and other sensitive electrical equipment within the network. The addition of a 100Amp lockable isolator also allows for safe and convenient isolation of all electrical equipment within the network including consumer units, solar inverters, battery storage units and EV chargers from the mains/grid in one place.

Surge protectors are in compliance with the recently updated 18th edition amendment 2 of BS7671.

Mains/Grid Isolation and Surge Protection

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Articles: Further Information, Calculators & Inverter Fault Codes

Lots of articles, calculators and technical information including links for further reading. Covering a range of topics related to the installation and maintenance of solar photovoltaic and electrical systems in the UK.

/Solar PV Information Articles

Fronius Primo Inverter Faults and Repairs

Fronius Primo inverters have LCD displays on the front of the chassis that providing it's working, will highlight any errors with the inverter or the solar PV system that it runs, we have listed and described common faults with Fronius Primo inverters and what action to take to resolve them.

How to provide power to a house using a portable generator

We look at changeover switches, the importance of earthing, generator loadings, isolating non essential loads. Where to locate the generator and how best to safely isolate the mains supply and switch to a generator supply.

Mains Power Supplies & Earthing Systems

Mains Supply and Earthing Systems: Location & accessability, supply systems, earthing, bonding, labelling, installing RCDs.

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What Our Customers Say:

"We had been let down by a failure on our system,and the manufacturer of the part was no longer trading. We called Glen during the afternoon and he was there in the evening. He examined the system and recommended a replacement manufacterer, promising to come back and fit in the new part once it arrived. We informed Glen of the arrival on a Friday PM, he was there fitting the new part by 10:30 on the following Monday. Of course it worked. That is what you call service, and guess who is looking after all our requirements in the future. Highly recommend this company." - Gill Spencer, Newbury

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Case Studies

We've carried out Solar PV System design, installation, testing, repair and maintenance work on solar PV systems of all shapes and sizes all across the UK.

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Areas Served:

We are located in Wanborough, very close to Swindon in Wiltshire, Southern England, UK. From here we service clients within a 90 minute driving radius including the towns, cities and regions below:

Swindon: Abingdon, Aldbourne, Andover, Banbury, Basingstoke, Bath, Berkshire, Bicester, Blunsdon, Box, Bracknell, Bradford on Avon, Bristol, Burford, Calne, Camberley, Carterton, Cheltenham, Chippenham, Chipping Norton, Chipping Sodbury, Cirencester, Corsham, Cricklade, Devizes, Didcot, Evesham, Faringdon, Fleet, Gloucester, Gloucestershire, Hampshire, Henley-on-Thames, Highclere, Highworth, Hook, Hungerford, Keynsham, Kingsclere, Lambourn, Lechlade, Lyneham, Maidenhead, Malmesbury, Marlborough, Marshfield, Melksham, Minety, Newbury, Oxford, Oxfordshire, Pewsey, Purton, Ramsbury, Reading, Royal Wootton Bassett, Salisbury, Shalbourne, Slough, Stow, Swindon, Tewkesbury, Thatcham, Trowbridge, Wanborough, Wantage, Warminster, Wiltshire, Winchester, Windsor, Witney, Wokingham, Worcester, Wroughton and Yate.

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