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SolarEdge Inverter and Optimser Faults and Repairs

Established in 2006, and shipping their first units in 2010, SolarEdge are a relative newcomer to the solar industry. SolarEdge have their headquarters in Israel, manufacturing is carried out by partner companies.

We have been asked to repair quite a few SolarEdge systems and when we have needed them, have found SolarEdge to be helpful and responsive. They are happy and quick to send out replacement parts under warranty once a fault with their equipment has been proven and the faulty unit returned. The good news is that many components have a comparatively long warranty period which SolarEdge will honour with or without the involvement of your original installer. If you would like help with diagnosing faults, carrying out servicing or repairs and or are currently without an installer then you will find us well qualified, experienced and pleased to help.

SolarEdge inverters (excluding the most recent ones) have LCD displays on the front of the chassis, which providing it's working, will highlight any errors with the inverter, the optimisers or the solar PV system that they run. We have listed and described common faults with SolarEdge inverters and optimisers and what action to take to resolve them below:

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SolarEdge Inverter and Optimiser 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.

  • V-Line Max or VLL Max - The inverter is measuring a grid (mains) voltage that is too high in relation to the parameters that the inverter has been set to safely operate within. If this fault persists contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or with the grid.
  • V-Line Min or VLL Min - The inverter is measuring a grid (mains) voltage that is too low in relation to the parameters that the inverter has been set to safely operate within. If this fault persists and mains power is available to other local circuits then check that all isolators, MCBs and RCDs on the AC side of the solar PV system are 'On'. If automatic safety devices such as MCBs or RCDs have switched 'Off' then leave them 'Off' and contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter, the supply circuit or with the grid.
  • I-ACDC L1/L2/L3 - AC Overcurrent - The inverter is measuring an AC current over the permissable range deemed to be safe by the inverter. The inverter will monitor the grid and reconnect when the current is within range. If this fault persists then contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or with the grid.
  • Phase Balance Error - The inverter is measuring an inbalance on the incoming phases from the grid (mains). If this fault persists then contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or with the grid.
  • Grid Sync Error - The inverter is no longer in grid parallel operation due to frequency fluctations from an unstable grid (mains) connection and has stopped feed‑in operation for safety reasons. If this fault persists contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or with the grid.
  • I-RCD STEP - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • I-RCD MAX - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • F-L1/L2/L3 Max 1/2/3 - The inverter is measuring a grid (mains) frequency that is too high in relation to the parameters that the inverter has been set to safely operate within. If this fault persists contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or with the grid.
  • F-L1/L2/L3 Min 1/2/3 - The inverter is measuring a grid (mains) frequency that is too low in relation to the parameters that the inverter has been set to safely operate within. If this fault persists and mains power is available to other local circuits then check that all isolators, MCBs and RCDs on the AC side of the solar PV system are 'On'. If automatic safety devices such as MCBs or RCDs have switched 'Off' then leave them 'Off' and contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter, the supply circuit or with the grid.
  • Islanding Trip 1/2 or Islanding-Active or Islanding-Passive - The inverter understands that there has been a mains failure (a power cut). The inverter will monitor the grid and reconnect when mains voltage returns. If this fault persists and mains power is available to other local circuits then check that all isolators, MCBs and RCDs on the AC side of the solar PV system are 'On'. If automatic safety devices such as MCBs or RCDs have switched 'Off' then leave them 'Off' and contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter, the supply circuit or with the grid.
  • TZ L1/L2/L3 - AC Overcurrent - The inverter is measuring an AC current over the permissable range deemed to be safe by the inverter. The inverter will monitor the grid and reconnect when the current is within range. If this fault persists then contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or with the grid.
  • Vsrg L1/L2 /L3 Max - The inverter is measuring an AC voltage surge from the grid (mains). The inverter will monitor the grid and reconnect when conditions are stable. If this fault persists then contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or with the grid.
  • Wrong AC connection - The inverter understands that the Live/Phase connectors are swapped on the AC supply side. This fault is unlikely to occur in an existing installation that has previously worked correctly. If this fault persists contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or the supply circuit.
  • Overtemp - The temperature within the inverter is too hot. This could be due to a number of factors, for example 1) If the inverter is exposed to direct sunlight 2) If the inverter has been installed without adequate ventilation around the chassis which would allow excess heat to dissipate 3) The inverters components are getting too hot due a blocked vent, a faulty or disabled fan or an internal component fault. If the unit isn't running hot and if after the system has been safely shutdown and restarted this condition persists then contact us.
  • Undertemp - The inverter is measuring an ambient temperature that is too cold. In the UK this error is possible but unlikely. If the inverter isn't frozen then if after the system has been safely shutdown and restarted this condition persists then contact us.
  • Main Error - The inverter is measuring a grid voltage or impedance that is either too low or too high in relation to the parameters that the inverter has been set to safely operate within. The inverter will monitor the grid and reconnect when the voltage is within range. If this fault persists and mains power is available to other local circuits then check that all isolators, MCBs and RCDs on the AC side of the solar PV system are 'On'. If automatic safety devices such as MCBs or RCDs have switched 'Off' then leave them 'Off' and contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter, the supply circuit or with the grid.
  • IRCDMax - This error is generated when during normal operation of the inverter, a surge current to ground/earth is detected on the DC side of the system. An error such as this could be an indication of a serious or sudden fault or damage to the DC side of the system. We would advise that you safely shutdown the system (contact us if you would like help to do this) and visually inspect the system for any obvious damage or fault. If safe to do so restart the system, connecting one DC string at a time. If this fault presists or a faulty string is found then book an engineers visit in order to carry out a full system test, identify the source and rectify the fault.
  • Temp Sensor fault - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • DC Injection (Line 1/2/3) - The inverter has detected a DC feed on the AC power input. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Fan # Failure - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • SW Error - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Hardware Error - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Measurement Error - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Faulty AC Relay - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • RCD Sensor Error - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • UDC Max - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • UDC Min - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Arc detector self-test failed - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Isolation - Isolation Error - This error is generated when during normal operation of the inverter, a leakage current to ground/earth is detected on the DC side of the system. Earth / Ground Faults (also called Iso or Isolation Faults) often present themselves when it is raining or at times of high humidity when moisture can enter the system. These faults often clear when conditions improve but they will not get better by themselves, potentially becoming more dangerous over time. We would advise that you book an engineers visit in order to carry out a full system test, identify the source and rectify the fault.
  • RCD Test - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Controller 3 Err - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Tz Over current 1/2/3 - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • SE Communication - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Communication Error - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Tz Over voltage cap 1/2/3 - The inverter is measuring a grid (mains) voltage that is too high in relation to the parameters that the inverter has been set to safely operate within. If this fault persists contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter, the supply wiring or with the grid.
  • Tz Over current Rcd - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Vf1/2/3 surge - The inverter is measuring an AC voltage surge from the grid (mains). The inverter will monitor the grid and reconnect when conditions are stable. If this fault persists then contact us to arrange for an engineer to visit to establish whether the fault lies with the inverter or with the grid.
  • RSD Error - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Unbalanced DC Voltage - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Common Voltage Too High - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • Pairing failed - The inverter is unable to connect with some or all of the optimsers. This can happen in low light levels and will often repair itself when conditions improve. If there is sufficient solar irradiation (sunlight) and the inverter still cannot find some or all of the optimsers, contact us to talk you through how to restart the pairing sequence and if neccessary, help you, using the LCD display on the inverter to find the non-reporting optimsers.
  • String voltage is 0V - Assuming that this is an existing installation that has been specified correctly and has operated before without problems. This could mean either a problem with the panels, an optimiser or with the inverter. We would advise that the DC side of the system including the inverter is tested.
  • String voltage not 0V but lower than number of optimizers - Assuming that this is an existing installation that has been specified correctly and has operated before without problems. This could mean either a problem with the panels, an optimiser or with the inverter. We would advise that the DC side of the system including the inverter is tested.
  • String voltage is higher than number of optimizers - The inverter is measuring too much voltage from the optimisers and panels. Assuming that this is an existing installation that has been specified correctly, hasn't recently been changed or added to and has operated before without problems. This could mean either a problem with the panels, an optimiser or with the inverter. We would advise that the DC side of the system including the inverter is tested.
  • Arc Fault Detected - The inverter is measuring an arc fault on the DC side of the system. An arc occurs when cables or connectors are incorrectly connected or damaged causing current to arc through the air. We would advise that you book an engineers visit in order to carry out a full system test, identify the source and rectify the fault as soon as possible.
  • DC Voltage Too High (surge) - The inverter is measuring too much voltage from the optimisers and panels. Assuming that this is an existing installation that has been specified correctly, hasn't recently been changed or added to and has operated before without problems. This could mean either a problem with the panels, an optimiser or with the inverter. We would advise that the DC side of the system including the inverter is tested.
  • Night Mode - The inverter will normally enter night mode when the level of solar irradiation (sunlight) drops below the level required to power the system. If your system should be stuck in 'Night Mode" at times when the system would normally be operational then this might be an indication of a fault on the DC side of the system such as with the panels, optimisers or with the inverter. Check that any isolators including any built in isolators on the underside of the inverter are switched 'On' if they are and everything looks correct then contact us to test the DC side of the system.

We are familiar and comfortable in working with these units, please let us know if there is anything that we can help with with regards to error codes and faults, repairs, specifying replacements and or if you have any performance or safety concerns.

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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 your 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.

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Problems with your solar power system? Solar panels not working? Solar Inverter Fault? Leaking Roof? Established in 2007, we are one of the longest serving renewable energy companies around and experts at fixing all things Solar.

If your original solar installer and or their warranty providers are no longer trading and your solar PV system isn't working, underperforming, has developed a fault or needs to be moved, refurbished, changed, decommissioned (permenantly or temporarily) then we can help.

If you have an issue, any issue with your solar PV system, including repairs needed to roofs, mountings, cables, isolators, meters, inverters, batteries and connectors; anything involved with repairing a residential and commercial solar PV systems of any size, then we can help.

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"Inverter broke down, contacted Glen, on his advice new inverter delivered within days. Glen then came and fitted new inverter within 90 mins, works perfectly. Glen is very friendly very efficient, really knows his work. Can highly recommend Glen, any other problems with solar system and Glen will be the one I call." - Carl Tyler, Salisbury

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"I spoke to Glen as my inverter was coming to its end of life (10 years). Glen quickly appraised me of the many different inverters that I could use. I selected a similar SMA type. The next week Alex replaced it with a new inverter with WiFi connectivity. Everything is working perfectly (thanks Alex) in-addition I can now view my information through the Sunny Portal. A BIG thanks to Glen and Alex, superb service, highly recommended!!!!!" - David Powell, Worcester

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"Rang In Balance energy after been let down. Scott was very helpful after explaining the problem. Explained everything to me. Sent a quote within a day. Arranged an appointment that suited me. Arrived at the time quoted the engineer was very polite. Explained everything again and sorted the problem... I would highly recommend this company for solar panel repairs.. And if needed again won't hesitate to contact them. Also the quote was for a brand new inverter. But as this wasn't needed only got charged for the work that was done.. Excellent service. Thankyou so much." - Julie Temperton, Gilberdyke

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"What a pleasant surprise. I found InBalance via Google when the inverter on my solar PV system failed and I was trying to find someone knowledgeable and reliable to fix or replace it. My first impression was that the comprehensive information on their web-site was a good start, far better than the web-sites of most of the shysters who now seem to fill the world of solar PV. The next positive was Scott of InBalance's rapid response, first to my initial enquiry and subsequently to visiting to analyse and report on the problem and then removing and replacing the inverter within just a couple of days. I hope I don't ever have another problem with my solar PV system but, if I do, the first people I shall call will be InBalance. Outstanding service and thoroughly recommended." - Tim Petty, Ilminster

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"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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"Yes, thank you! The Inverter appears to be working well. Scott was very efficient and courteous, he couldn't have been more helpful. Thank you very much for your prompt and efficient service, apart from the expense (not your fault), it has been a pleasure working with you." Tracey Smale, Dartmouth

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"In Balance contacted us promptly after we made an enquiry, Glen telephoned and arranged to visit our property to identify the fault, he arrived the following day! Brilliant as when the system is down it isn't earning us money. We decided to have a new inverter installed as our original one was 9 years old. Glen ordered the unit which was delivered to our property he then arrange to fit the unit the following day. He really could not have done it any quicker so thank you for that. Good job done for reasonable money. Highly recommended." - Geoff Thomas, Abingdon

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"Contacted Glen after being let down by 2 companies. He visited promptly, researched my system and assisted me with getting my solar system up and running again. Amazing man. Will definitely be my first and only port of call for any future issues. Friendly, supportive, knowledgeable and reliable. Highly recommend him." Margaret Bissett, Chisledon

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"Can't recommend In Balance Energy and Glen enough. I had a fault in a solar tile that needed tracking down. Other companies did not want to know as too much hassle. Glen saw it as a challenge and was all over it. Problem fixed and full power restored. Well done and thanks." Paul Rodwell, Wallingford

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"We were very relieved to find Glen when our Solar Panel system stopped working, as our original supplier had gone out of business. We cannot praise Glen's persistence enough as he thoroughly reviewed the system to identify the faults and repair it, despite the searing heat of last summer. He also talked to Solar Edge and provided fault data to enable us to get a replacement part under warranty. Many thanks Glen for getting us up and running again!" - Jane Pearce, Highworth

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"Excellent service. We contacted Glen when our solar PV system stopped working. His response was prompt, he explained all we needed to know and got the system up and running after just a matter of days. Glen was friendly, professional and most of all reliable and we would have no hesitation in highly recommending him." Fran Armstrong, Market Lavington

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"Glen was very helpful and very reasonably priced. I would recommend him, and use him again in future if I need any solar work." Venu Jega, Highworth

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"Very efficient reliable company. Scott was the engineer who attended to fix my solar breakdown, which he did very quickly and reasonably. Would recommend very highly." Paul Slatter, Ivybridge

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"Outstanding. Conscientious, thorough, friendly and reasonably priced service. Highly recommended. Made our solar panel battery system safe, correcting the sub-standard work of others. Will always use this trustworthy PV electrician. Even after the work was completed, he studied the manual for our system and assisted with resolving further problems. Thanks Glen." Rob Barnes, Royal Wootton Bassett

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"Very decent with a helpful attitude and expert in the technical side and reliable too. Had to integrate with our roofers to use their scaffolding before and after their work to take down and reinstall our PV panels. Helpful scheduling. Up and running again to our satisfaction at a decent price." David Ballard, Ramsbury

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"I got in touch with Glen as our old converter was no longer working due to its age (9 years). Glen quickly diagnosed the inverter and tested the solar panels. The next week replaced it with a new inverter with WiFi connectivity. Everything is working again perfectly and I can see what power it's generating on a phone App now. Great service!!" Peter Dowsett, Chippenham

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"Glen replaced our inverter. Excellent honest guy. We wouldn’t deal with anyone else highly recommended." Nicola Moger, Devizes

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"Our inverter failed and as our installer had gone out of business did not know what to do. Contacted Glen who was brilliant. Came out checked the failure dealt with the manufacturer and all aspects of the warranty claim.New inverter received under warranty and Glen came out and fitted the new one straightaway. Superb service from a very professional and helpful person. Highly recommend this company." Martin Brailey, Wokingham

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"Had a tricky fault on my (8 year) old system which Glen narrowed down and has now sorted at a very reasonable price. We have also had our faulty inverter replaced by In Balance; would recommend if he covers your area!" Peter Nobes, Bath

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"My inverter failed and Glen very quickly got my system up and running again. He was very professional but explained everything to me. Many thanks Glen and I've already recommended him." Di Foxwell, Wroughton

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