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Mastervolt Inverter Faults and Repairs

Dutch company Mastervolt, founded in 1991, launched it's first photovoltaic inverter in 1993. Mastervolt are now part of power conversion and management equipment giants Power Products LLC. Mastervolt Sunmaster and the smaller Soladin ranges of inverters were widely installed in the UK between 2011 and 2014. Popular Sunmaster models being the Sunmaster XS2000, Sunmaster XS3200 and the Sunmaster XS4300.

Mastervolt are no longer manufacturing or supporting grid connected solar PV inverters and should they be needed, we are not able to source parts to fix these inverters. Mastervolt still enjoy a strong presence in the off-grid solar PV market.

Mastervolt Sunmaster inverters have an LCD display on the front of the chassis, which providing it's working, will highlight any errors with the inverter or the solar PV system that it runs. The Soladin range doesn't have a display, instead they communicate their status through different sequences of flashing lights. We have listed and described common faults with Mastervolt Sunmaster and Mastervolt Soladin inverters and what action to take to resolve them below:

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Repair Mastervolt Sunmaster Inverter

 

 

Mastervolt Sunmaster 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 pleased to talk you through the process over the telephone at no charge.

  • VAC HIGH - 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.
  • VAC LOW - 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.
  • ENS OFF - The inverter has detected a fault with the AC power supply, this could be due to damaged or faulty AC wiring or it might be picking up a disturbance on the mains supply power network. 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.
  • G83 OFF - The inverter has detected a fault with the AC power supply, this could be due to damaged or faulty AC wiring or it might be picking up a disturbance on the mains supply power network. 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.
  • FAC HIGH - 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.
  • FAC LOW - 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.
  • NO GRID - The inverter is not measuring a grid (mains) voltage suggesting that mains power to the unit has been disconnected. 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.
  • SOL1 HIGH - 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 is disconnected using either the built in DC isolator at the bottom of the inverter or the DC Isolator installed between the panels and the inverter (if available) and contact us to test the DC side of the system including and excluding the inverter.
  • TEMP HI - 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 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.
  • INSULATION - 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.
  • NTC 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.
  • EF I2C 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.
  • ENS 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.
  • CB I2C 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.
  • HW VAC FAC - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • HW 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.
  • HW 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.
  • HW 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.
  • HW ERROR 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.
  • HW 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.
  • HW ERROR 5 - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • HW ERROR 6 - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • HW ERROR 7 - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • HW ERROR 8 - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
  • HW ERROR 9 - This is an internal error within the inverter. If after the system has been safely shutdown and restarted this condition persists then contact us.
Repair SMA Sunnyboy Inverter

Mastervolt Soladin Inverter Faults and Warnings:

  • ▬▬▬▬▬▬▬▬ Uninterrupted red light - No grid voltage - The inverter is not measuring a grid (mains) voltage suggesting that mains power to the unit has been disconnected. 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.
  • • • • • • Red blinking light - 1 time - The inverter is measuring low DC voltage. Assuming that this is an existing installation that has been specified correctly, there is sufficient irradiation (sunlight), no changes near the installation area have been carried out and the system has operated before without problems, then we would advise that the DC side of the system including and excluding the inverter is tested.
  • •• •• •• •• Red blinking light - 2 times - 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 and excluding the inverter is tested.
  • ••• ••• ••• Red blinking light - 3 times - 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.
  • •••• •••• Red blinking light - 4 times - 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.
  • ••••• ••••• Red blinking light - 5 times - The inverter is measuring a grid frequency that is either too low or too high 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.
  • •••••• •••••• Red blinking light - 6 times - 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 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.
  • ••••••• ••••••• Red blinking light - 7 times - 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, so 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

Recomendation via Facebook

"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

Recomendation via Facebook

"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

Review via Google

"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

Recomendation via Facebook

"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

Recomendation via Facebook

"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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"New meter doing the business nicely. Good job, great service and friendly with it. Our thanks." Richard Illsley, Marlborough

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