LuxPowerTek Fault Code Index
Every LuxPowerTek inverter error and warning code from the official LXP hybrid and SNA off-grid manuals — what each E-code and W-code means, the most likely cause, and what to do next. Covers LXP 3–6K, LXP 4–6K HB, and SNA 3–5K models.
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LuxPowerTek Fault Code Index
- Sourced from official LuxPowerTek manuals
- Covers hybrid and off-grid inverter series
- E-codes (errors) and W-codes (warnings)
If your Lux inverter is showing an error or warning code and you need expert diagnosis, a remote diagnostic identifies the cause and recommends the fix — usually within 30 minutes.
Book free Lux diagnosisHow diagnostics workI have a GivEnergy system consisting of two batteries, two inverters and a controlling EMS (Energy Management System) which has not worked since Nov 2025. After six months I discovered Solar Tech Support, reached out to them and Ron phoned me back – how often do you get that service? Could not be more helpful – worked directly with me over the phone, outside what I would call normal working hours. Lucid explanations and we were able to discuss the issues and history using camera and email history. As this was a very rare setup, Ron was able to access an EMS expert in the field to confirm the solution. One sunny day in, I am now only paying for standing charge and a few pence for spikes in grid consumption while battery catches up with house demand.
When my GivEnergy system had an issue, I was completely left without support and had honestly lost all hope. Thankfully, I searched online and found Ron, which completely turned things around. After sending him a message, he responded incredibly fast and called me to assure me that he would get the problem fixed. I really admire his dedicated, supportive nature and his determination to find a solution. With this kind of outstanding attitude and customer service, he has absolutely secured a future customer in me.
Ron want out of is way to help, nothing was to much. He was very thorough in what he did Very knowledgeable I would highly recommend Ron and his company He did a fantastic job for me. if you have any problems, he'll do his best to help you out and resolve your problem. I wouldn't hesitate to recommend them
Ron took me through a diagnostic to confirm my GivEnergy Inverter had a fault. A common one as it turns out with the AC Inverter. As GivEnergy is defunct there is no immediate fix, aside from sourcing 2nd hand replacement. It may be that a fix becomes available over the summer which would make a lot of GivEnergy customers happy (Again)
Contacted Ron with a problem and he sorted it out quickly with no problems at all. Very knowledgeable on anything solar/ batteries. I would recommend him to anyone
I've spoken to Ron a couple of times with issues with my Givenergy installation. Such a friendly knowledge guy very highly recommended. Thank you very much for resolving my issues
Contacted Solar Tech Support in desperation. After explaining the issues I had with my system a diagnosis was made and a solution proposed. Fantastic service, even contacted a manufacturer to arrange replacement parts for me. Great communications, explained all they were doing and what I had to do, clearly and precisly. Followed up to confirm all was ok. Excellent service.
After GivEnergy went into liquidation, just my luck, my battery started playing up (internal board crashed). Contacted my installer - not interested! Found Solar tech support on a Google search. Sooo glad I found this company! Ron is extremely helpful and has plenty of experience. He soon confirmed what the fault was, and helped me to get my system up and running again. Now moved my GivEnergy account to Solar tech support, and will definitely use again if I have more issues. Unusual to find such a helpful company in these times, no morons reading scripts, just direct contact with the engineer.
Contacted Solar Tech Support when trying to understand what my Givenergy inverter problem might be and what might be my options. Received good/honest advise which backed up my thoughts.
Ron is a super star. Two months ago my GivEnergy battery failed a firmware upgrade leaving it a brick. My installer couldn't/wouldn't fix it. GivEnergy couldn't/wouldn't fix it. Then they went into administration and all hope was lost. A flurry of emails later and Ron had diagnosed the fault (failed USB flash drive, something I'd suspected) and talked me through resolving it. Two months of nothing resolved in about 3 hours. It's great to work with someone who pays attention to the details, knows that they're doing (not just following a script) and gets stuff sorted without a fuss or up-charging.
I can add to the list of customers who had already 'given up' on GivEnergy due to their appalling customer service, and that was before they went into administration (their Trustpilot reviews don't lie!). So you can imagine my desperation when, having changed my ISP and my Inverter, predictably, proving to be the only device that didn't connect automatically to my new network, I found zero prospect of any customer support with GivEnergy having called in the administrators just five days earlier! The salvation came from Solar Tech Support. My IT advisor stumbled across their web site and some very helpful tips for beleaguered GivEnergy customers, as well as an offer to provide direct assistance. Nothing ventured, I decided to drop them an E-Mail, with very low expectations based on my experience of GivEnergy customer support. Within an hour Ron had responded with some pin point advice, and after a few exchanges of E-Mails he had nailed the problem, enabling the combined efforts of my IT advisor and solar installer to resolve it and reconnect my Inverter. Thank you Solar Tech Support, and Ron in particular, for coming to the aid of a deserted and despondent GivEnergy customer. Expert, razor sharp advice and first class customer service, even though I wasn't officially a customer.
This company are a rare gem, I had a very unusual problem following a failed firmware upgrade on my GivEnergy kit. I then found out GivEnergy were in administration and had dismissed all their support staff! None of the usual fixes to try and restore my inverter comms would work, and I looked everywhere, forums, GivEnergy youtube support videos - even AI couldn't figure it out. My installer was talking about huge sums for system replacements, and being vague / evasive about if they'd even install replacement GivEnergy inverter. Enter Solar Tech Support, reassuring and knowledgeable from the very start, I've learnt loads about my solar system though the friendly chat while my engineer worked as he diagnosed the problem and figured out a fix procedure that I've not found anywhere else - amazing . If you need solar system repairs - especially if you like me have been left high and dry by GivEnergy, I cannot recommend this company enough. Give them a call.
I sent a message on their website regarding a problem I have on my Givenergy system. Although not supplied by Ronald, I thought it was worth an email. Within the hour on a Saturday, he phoned and we discussed the problem. He logged in remotely and gave excellent advice. I'm too far away for his on-site help but he did diagnose the problem and was happy also to chat through my thoughts about an upcoming solar/battery install I'm planning. Great bloke.... if only he was nearer!
I have a GivEnergy system consisting of two batteries, two inverters and a controlling EMS (Energy Management System) which has not worked since Nov 2025. After six months I discovered Solar Tech Support, reached out to them and Ron phoned me back – how often do you get that service? Could not be more helpful – worked directly with me over the phone, outside what I would call normal working hours. Lucid explanations and we were able to discuss the issues and history using camera and email history. As this was a very rare setup, Ron was able to access an EMS expert in the field to confirm the solution. One sunny day in, I am now only paying for standing charge and a few pence for spikes in grid consumption while battery catches up with house demand.
When my GivEnergy system had an issue, I was completely left without support and had honestly lost all hope. Thankfully, I searched online and found Ron, which completely turned things around. After sending him a message, he responded incredibly fast and called me to assure me that he would get the problem fixed. I really admire his dedicated, supportive nature and his determination to find a solution. With this kind of outstanding attitude and customer service, he has absolutely secured a future customer in me.
Ron want out of is way to help, nothing was to much. He was very thorough in what he did Very knowledgeable I would highly recommend Ron and his company He did a fantastic job for me. if you have any problems, he'll do his best to help you out and resolve your problem. I wouldn't hesitate to recommend them
Ron took me through a diagnostic to confirm my GivEnergy Inverter had a fault. A common one as it turns out with the AC Inverter. As GivEnergy is defunct there is no immediate fix, aside from sourcing 2nd hand replacement. It may be that a fix becomes available over the summer which would make a lot of GivEnergy customers happy (Again)
Contacted Ron with a problem and he sorted it out quickly with no problems at all. Very knowledgeable on anything solar/ batteries. I would recommend him to anyone
I've spoken to Ron a couple of times with issues with my Givenergy installation. Such a friendly knowledge guy very highly recommended. Thank you very much for resolving my issues
Contacted Solar Tech Support in desperation. After explaining the issues I had with my system a diagnosis was made and a solution proposed. Fantastic service, even contacted a manufacturer to arrange replacement parts for me. Great communications, explained all they were doing and what I had to do, clearly and precisly. Followed up to confirm all was ok. Excellent service.
After GivEnergy went into liquidation, just my luck, my battery started playing up (internal board crashed). Contacted my installer - not interested! Found Solar tech support on a Google search. Sooo glad I found this company! Ron is extremely helpful and has plenty of experience. He soon confirmed what the fault was, and helped me to get my system up and running again. Now moved my GivEnergy account to Solar tech support, and will definitely use again if I have more issues. Unusual to find such a helpful company in these times, no morons reading scripts, just direct contact with the engineer.
Contacted Solar Tech Support when trying to understand what my Givenergy inverter problem might be and what might be my options. Received good/honest advise which backed up my thoughts.
Ron is a super star. Two months ago my GivEnergy battery failed a firmware upgrade leaving it a brick. My installer couldn't/wouldn't fix it. GivEnergy couldn't/wouldn't fix it. Then they went into administration and all hope was lost. A flurry of emails later and Ron had diagnosed the fault (failed USB flash drive, something I'd suspected) and talked me through resolving it. Two months of nothing resolved in about 3 hours. It's great to work with someone who pays attention to the details, knows that they're doing (not just following a script) and gets stuff sorted without a fuss or up-charging.
I can add to the list of customers who had already 'given up' on GivEnergy due to their appalling customer service, and that was before they went into administration (their Trustpilot reviews don't lie!). So you can imagine my desperation when, having changed my ISP and my Inverter, predictably, proving to be the only device that didn't connect automatically to my new network, I found zero prospect of any customer support with GivEnergy having called in the administrators just five days earlier! The salvation came from Solar Tech Support. My IT advisor stumbled across their web site and some very helpful tips for beleaguered GivEnergy customers, as well as an offer to provide direct assistance. Nothing ventured, I decided to drop them an E-Mail, with very low expectations based on my experience of GivEnergy customer support. Within an hour Ron had responded with some pin point advice, and after a few exchanges of E-Mails he had nailed the problem, enabling the combined efforts of my IT advisor and solar installer to resolve it and reconnect my Inverter. Thank you Solar Tech Support, and Ron in particular, for coming to the aid of a deserted and despondent GivEnergy customer. Expert, razor sharp advice and first class customer service, even though I wasn't officially a customer.
This company are a rare gem, I had a very unusual problem following a failed firmware upgrade on my GivEnergy kit. I then found out GivEnergy were in administration and had dismissed all their support staff! None of the usual fixes to try and restore my inverter comms would work, and I looked everywhere, forums, GivEnergy youtube support videos - even AI couldn't figure it out. My installer was talking about huge sums for system replacements, and being vague / evasive about if they'd even install replacement GivEnergy inverter. Enter Solar Tech Support, reassuring and knowledgeable from the very start, I've learnt loads about my solar system though the friendly chat while my engineer worked as he diagnosed the problem and figured out a fix procedure that I've not found anywhere else - amazing . If you need solar system repairs - especially if you like me have been left high and dry by GivEnergy, I cannot recommend this company enough. Give them a call.
I sent a message on their website regarding a problem I have on my Givenergy system. Although not supplied by Ronald, I thought it was worth an email. Within the hour on a Saturday, he phoned and we discussed the problem. He logged in remotely and gave excellent advice. I'm too far away for his on-site help but he did diagnose the problem and was happy also to chat through my thoughts about an upcoming solar/battery install I'm planning. Great bloke.... if only he was nearer!
Faults and warnings triggered by problems with the AC mains supply, grid voltage, grid frequency, or meter connections. Warning codes self-clear when conditions normalise; error codes stop the inverter.
E023 — Neutral fault
LCD: E023 · LXP hybrid series
W016 — No AC connection
LCD: No AC connection · LXP hybrid
W017 — AC voltage out of range
LCD: AC V Outrange · LXP hybrid
W018 — AC frequency out of range
LCD: AC F Outrange · LXP hybrid
W030 — Meter connection reversed
LCD: Meter Reversed · LXP hybrid
Fault codes caused by problems with the solar panel DC input — overvoltage, short circuits, and insulation failures. PV voltage errors are serious and may indicate an unsafe string configuration.
E021 — PV voltage high
⚠ Do not touch DC cabling
E024 — Both PV short circuit
⚠ Disconnect PV at DC isolator
W020 — PV isolation low
LCD: PV Isolation low · LXP hybrid
W023 — PV short circuit
LCD: PV short · LXP hybrid
Codes related to battery communication, voltage limits, temperature sensors, and hardware failures. W000 (battery communication fault) is the most common Lux warning in UK installations.
E002 — Bat On Mos Fail
⚠ Hardware fault — SNA series
W000 — Battery communication fault
LCD: Bat Com Fault · all series
W003 — Meter communication fault
LCD: Meter Com Fault · LXP hybrid
W004 — Battery failure
LCD: Battery failure · all series
W025 — Battery voltage high
LCD: Bat Volt High · all series
W026 — Battery voltage low
LCD: Bat Volt Low · all series
W027 — Battery open circuit
LCD: Bat open · all series
Faults on the backup power (UPS/EPS) output — short circuits, overloads, and wiring errors. These codes appear when the backed-up circuit has an issue.
E012 — UPS short circuit
⚠ Disconnect loads immediately
E013 — UPS power reversed
⚠ Wiring fault — qualified electrician
E020 — UPS connection fault
LCD: E020 · all series
W028 — UPS over load
LCD: UPS Over Load · all series
Error codes specific to multi-inverter parallel installations. These only appear when two or more Lux inverters are connected via CAN bus in a parallel configuration. Single-inverter systems will never show these codes.
E001 — Model fault
LCD: E001 · parallel config error
E008 — Parallel CAN fault
LCD: E008 · CAN bus failure
E009 — Primary loss
LCD: E009 · master inverter missing
E010 — Multiple Primary
LCD: E010 · duplicate master config
E011 — Parallel AC inconsistent
LCD: E011 · AC mismatch
E015 — Parallel phase abnormal
LCD: E015 · three-phase assignment
Internal processor communication failures, relay faults, overcurrent, overtemperature, and bus voltage errors. Most require a restart as a first step — persistent codes typically indicate hardware failure.
E000 — Internal communication fault 1
LCD: E000 · DSP comm failure
E016 — Relay fault
⚠ Safety isolation — do not bypass
E019 — Bus voltage high
LCD: E019 · DC bus overvoltage
E022 — Over current
LCD: E022 · internal overcurrent
E025 — Temperature over range
LCD: E025 · overtemperature shutdown
E026 — Internal fault
LCD: E026 · general hardware fault
E027 — Sampling inconsistent
LCD: E027 · LXP hybrid only
E031 — Internal communication fault 4
LCD: E031 · DSP comm failure variant
W005 — Auto Test failure
LCD: Auto Test failure · LXP hybrid
W009 — Fan Stuck
LCD: Fan Stuck · SNA off-grid
W021 — Leakage current high
LCD: Leakage I high · LXP hybrid
W022 — DC injection high
LCD: DC Injection high · LXP hybrid
LuxPowerTek add new fault codes with firmware updates, and some codes are specific to newer GEN series models not covered in the original LXP and SNA manuals. If your code isn't listed, share the exact text from the inverter LCD or Luxpower View alarm log and we'll identify it.
Full diagnostic — CAN/RS485 cable, battery brand setting, DIP switches, and firmware compatibility.
Timer settings, Agile mode, force charge, and Luxpower View configuration.
Official LXP and SNA user manuals, wiring diagrams, and quick-start guides.
LuxPowerTek fault code questions
Got an error code and need it diagnosed?
Share the exact fault code from the inverter LCD or Luxpower View, describe what the system is doing, and when the fault first appeared. We'll identify the cause and tell you whether it needs a remote settings fix or a site visit.
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- Free remote diagnostic · no fix, no fee
- Written report with cause and recommended action
Got a solar fault or need a quick answer? Drop us a message — we usually reply within a few minutes. Mon–Fri, 9am–7pm.