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ABB / Power One Aurora Inverter Faults and Repairs

Power One, at one point were the second ranked inverter manufacturer in the world and there are many Power One Aurora Inverters installed in the UK. The most popular models being the Uno PVI-3.0-TL-OUTD and the Uno PVI-3.6-TL-OUTD. Power One was purchased by electrical equipment giants ABB in 2013. As part of their purchase ABB took over the guarantee responsibilities from Power One.

As a result of their popularity we have become very familiar with repairing, servicing and diagnosing faults with Power One Inverters. Power One Aurora inverters, both single phase (Uno) and three phase (Trio) have an LCD display on the front of the chassis. Identifying error codes shown on the display (assuming the display is working) is usually the best place to start in diagnosing the fault and getting systems using Power One inverters up and running again.

NB: "E031 - Error Read V" or "Int.Error E031" This is a common error found with Power One Aurora Inverters. This is an error inside the inverter relating to damaged external relays. This error is often accompanied by a humming noise when the inverter tries to start up and presents itself just before you would typically expect the inverter to connect to the grid and start generating. Damaged relays can be replaced and we can source the replacement parts required to do the work. However, given the age of the units that usually demonstrate this fault and the comparitively low cost of a replacement, when Power One Aurora units are out of warranty and have E031 relay failures, we usually recommend that the inverter is replaced.

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Repair Power One Inverter

 

 

Repair Power One Inverter

ABB / Power One Aurora 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.

  • W001 - Sun Low - The inverter is measuring low DC voltage that it believes is due to low solar irradiance. Low irradiance (sunlight) is to be expected in the mornings and evenings and on cloudy days and the inverter, if the fault passes on it's own relatively quickly might simply be acknowledging this. However should there be plenty of sunlight and assuming that this is an existing installation that has been specified correctly, no changes near the installation area have been made and the system has operated before without problems. This could indicate either a problem with the panels or with the inverter. If you are concerned and or the fault doesn't clear itself, then we would advise that the DC side of the system including and excluding the inverter is tested.
  • W002 - Input UV - The inverter is measuring low DC voltage. Assuming that this is an existing installation that has been specified correctly, no changes near the installation area have been carried out and the system has operated before without problems. Anything other than a brief warning on the display at startup or shutown with this error code could indicate either a problem with the panels or with the inverter. If you are concerned and or the fault doesn't clear itself, then we would advise that the DC side of the system including and excluding the inverter is tested.
  • W003 - Grid Fail - The inverter is measuring grid (mains power) characteristics outside of it's pre-set safe operating parameters. If the situation persits then the inverter will not startup. We would advise that you book an engineers visit who will be able to identify whether the issue is with the inverter or with the mains supply.
  • W010 - Fan Broken - This error indicates an internal fan failure within the inverter.
  • W011 - Bulk UV - The inverter is measuring under voltage. 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 or with the inverter. We would advise that the DC side of the system including the inverter is tested.
  • W012 - Batt. Flat - The inverter is stating that the buffer battery inside the inverter is flat i.e. is not charging due to either a faulty battery or an internal charging error. To ensure that this is the case safely isolate the inverter and then restart it, if the time and date has reset itself to it's factory default time, reset the date and time to the correct date, then restart the system again. If the time again resets to the factory default time and date then there is either an issue with the battery which should be replaced or an internal fault within the inverter preventing the battery from being charged.
  • E001 - Input OC - The inverter is measuring too much current from the 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 or with the inverter. We would advise that the DC side of the system including the inverter is tested.
  • E002 - Input OV - The inverter is measuring too much voltage from the 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 or with the inverter. We would advise that the DC side of the system including the inverter is tested.
  • E003 - No Parameters - This is an internal error related to the main microcontroller and communications within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • E004 - Bulk Overvoltage - The inverter is measuring too much voltage from either the panels or the mains. 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, the mains or with the inverter. We would advise that the whole system AC and DC as well as the inverter is tested.
  • E005 - Comms. Error - There is a communications error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • E006 - Output OC - Output Overcurrent, this fault/warning occurs when the output current exceeds the threshold that the inverter has been designed for. 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 fault would suggest that there is a fault within the inverter.
  • E007 - IGBT SAT - This fault is an indication that the IGBT components within the inverter have become saturated. There are many factors that could contribute to this such as rapidly changing AC voltages from the grid or changing DC voltages from the panels. If the fault doesn't clear itself and the measured (excluding the inverter) conditions are stable it would most likely indicate an internal fault within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • E009 - Internal 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.
  • E010 - Bulk Low - The inverter is measuring low voltage. 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 or with the inverter. We would advise that the DC side of the system including the inverter is tested.
  • E011 - Ramp Low - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • E012 - DcDc Fail - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • E014 - Over Temp - The temperature inside the inverter is too hot, over the safe 60 degree limit. 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 to 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.
  • E015 - Bulk Cap Fail - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • E016 - Inverter Fail - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • E017 - Start Timeout - This error might present itself when startup voltages are hovering around the threshold required to fully start the inverter in conditions of low irradiance. Low irradiance (sunlight) is to be expected in the mornings and evenings and on cloudy days and the inverter, if the fault passes on it's own relatively quickly might simply be acknowledging that power is present but not at a level sufficient enough to fully power the inverter. However should there be plenty of sunlight and assuming that this is an existing installation that has been specified correctly, no changes near the installation area have been made and the system has operated before without problems. This could indicate either a problem with the panels or with the inverter. If you are concerned and or the fault doesn't clear itself, then we would advise that the DC side of the system including and excluding the inverter is tested.
  • E018 - Ground Fault - 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, although it is also possible that the inverter generates the alarm E018 message due to AC leakage currents connected to the capacitive nature of the photovoltaic generator compared to ground/earth. For as long as the situation persits then the inverter will not startup. 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.
  • E019 - Ileak.sense Fail - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • E020 - Self Test Error 1 - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • E021 - Self Test Error 2 - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • E022 - Self Test Error 4 - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • E023 - DC In Error - Rapidly changing DC voltages due to rapidly fluctuating irradiance levels or possibly grid disturbances might be the likely cause of an E023 error. If the fault doesn't clear itself and the measured (excluding the inverter) conditions are stable it would most likely indicate an internal fault within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • E024 - Internal 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.
  • E025 - Riso Low - 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, although it is also possible that the inverter generates the alarm E018 message due to AC leakage currents connected to the capacitive nature of the photovoltaic generator compared to ground/earth. For as long as the situation persits then the inverter will not startup. 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.
  • E026 - Vref 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.
  • E027 - Error Meas V - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • E028 - Error Meas F - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • E029 - Mid Bulk OV - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • E030 - IError Meas Ileak - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • E031 - Error Read V - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us. (NB: Please see the note about this error in the introduction at the top of the page)
  • E032 - Error Read I - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • E033 - UTH - The ambient temperature outside the inverter is too cold, under the safe -25 degree limit. If the unit isn't in such a cold environment and if after the system has been safely shutdown and restarted this condition persists then contact us.
  • E034 - Interlock Fail - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • E036 - V Out Avg Error - The grid voltage as measured by the inverter is too high. This may be caused by too high a grid impedance. In the final stage of the timeout, the inverter limits the power to check whether the grid voltage has stabilised into regular parameters. If the situation persits then the inverter will not startup. We would advise that you book an engineers visit who will be able to identify whether the issue is with the inverter or with the mains supply.
  • E049 - AC FF 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.
  • E057 - Vbulk Reading Error - The inverter is measuring too much voltage from the 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 or with the inverter. We would advise that the DC side of the system including the inverter is tested.
  • E058 - Pin Vs Pout Check 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.

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.

 

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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"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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"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

Review via Cylex

"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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"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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"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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