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Fault code index · Powerwall 2 · Powerwall 3 · Gateway

Tesla Powerwall Fault & Alert Guide

Every Tesla Powerwall app alert, LED indicator state, and Gateway error — what each notification means, the most likely cause, and what to do next. Covers Powerwall 2, Powerwall 3, Powerwall+, Backup Gateway 2, and Backup Switch.
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Book Powerwall diagnosisAll fault codes
  • Alerts shown in the Tesla app
  • LED states + Gateway status
  • Powerwall 2 · Powerwall 3 · PW+
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Massively massively recommended. We had a big battery array (49kW across three phases) put in four years ago. c £35k cost. It’s been a total nightmare for many reasons, not least 1. our installer being totally useless and unresponsive and 2. Givenergy, our battery supplier, going bust. Long story short it had never worked anywhere near properly despite countless hours on phones and emails; the best we’d achieved was one third of the batteries working. Rather than write it off, I asked a PM friend to try to source someone who could come on site and review and revive the system. He found Solar Tech Support and Ron. Ron assured us he was the man to get it going again. After so many years of pain, I was not convinced but, true to his word, five hours later it was up and running. Lovely chap, super knowledgeable with a support team to lean on who are also clearly super technical. I honestly didn’t think there was much chance of getting this array going ever again so was absolutely delighted when Ron and team pulled it off. Bravo!

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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.

Ian · May 2026
LED indicator states

The LED on the front of the Powerwall shows operating status through colour and pattern. Powerwall 2 has a single LED strip on the right side. Powerwall 3 has a logo LED plus a separate status LED. Check the LED first when investigating a fault — it tells you the unit's state before you open the app.

Solid greenNormal · standby
The Powerwall is connected, communicating with the Gateway, and in standby — ready to charge or discharge as needed. This is the normal idle state when the battery is not actively cycling. No action required.
Pulsing greenNormal · active
The Powerwall is actively charging or discharging. The pulsing rhythm indicates energy flow. This is normal operating behaviour — the battery is either storing solar energy, discharging to power your home, or participating in a time-of-use schedule. No action required.
Solid whiteNormal · PW3 operating
On Powerwall 3, a solid white logo LED means the system is operating normally. The separate status LED may show additional information — light blue/aqua means the unit is ready for commissioning, and other colours indicate different setup stages. If the logo LED is solid white, the system is healthy.
Flashing greenWarning · no Gateway comms
The Powerwall is powered on and enabled but cannot communicate with the Gateway. The battery itself is functional but the monitoring link is down — the Tesla app will show no live data. Check your internet connection, restart the router, and verify the Gateway has power. If the Gateway is accessible, press the reset button. On a Backup Gateway 2 this is behind a small cover on the front panel. If flashing green persists after a Gateway reset, the communication hardware may be faulty.
Flashing red Fault detected or firmware updating
A flashing red LED means either an internal fault has been detected or a firmware update is in progress. During a firmware update, the red flash is expected and will stop once the update completes — do not power cycle during an update. If the red flash persists for more than an hour, or the Tesla app shows "Powerwall Disabled" or "Service Required", an internal fault has occurred. Turn off the Powerwall enable switch and contact your installer or Tesla support.
Blinking / no data transferWarning · app offline
The LED is blinking in a pattern that indicates no data is being transferred to the Tesla app. The power flow screen in the app may be greyed out or blank. Check that the Gateway has an active internet connection — Wi-Fi, Ethernet, or cellular. If the Gateway itself has lost power, the LED on the Gateway will be off. Restart the Gateway or check the breaker supplying it.
LED offNo power · breaker open
The Powerwall has no power. Check the circuit breaker connecting the Powerwall to your electrical system — if it has tripped or been turned off, the LED will be completely dark. Also check the enable switch on the side of the Powerwall unit. If the breaker is on and the enable switch is on but the LED is still off, the unit may have an internal power supply fault and needs professional inspection.
Tesla app alerts

The Tesla app delivers push notifications and in-app alerts when your Powerwall changes state or detects an issue. You need an active internet connection on both your phone and the Gateway to receive these. Some alerts are informational (e.g. going off-grid during a power cut), while others require action.

Breaker OpenAlert · electrical
The circuit breaker connecting the Powerwall to your home's electrical system is in the off position. The Powerwall cannot charge, discharge, or provide backup while the breaker is open. Locate the breaker in your consumer unit that feeds the Powerwall circuit and switch it back on. If the breaker trips again immediately, there may be a wiring fault on the Powerwall circuit that needs an electrician.
Side Switch OffAlert · manual
The enable switch on the side of the Powerwall unit has been turned off. The Powerwall will not power your home. On Powerwall+ and Powerwall 3, solar generation will also stop because the inverter is integrated. On Powerwall 2, solar may continue generating through your separate inverter. Check the switch on the right-hand side of the unit and flip it to the on position.
Rapid Shutdown Device OffAlert · safety switch
The Tesla app banner reads "Powerwall or PV Inverter will not operate". A rapid shutdown device fitted to your system has been switched off, so the Powerwall will not power your home. Solar may still generate depending on your system configuration. Tesla notes the device may look like a red emergency-stop button or a separate marked switch near the Powerwall or solar inverter. Rapid shutdown initiators are not a UK regulatory requirement and presence varies by install, so first check whether your installer fitted one and whether anyone switched it off, deliberately or during building work. If you are not expecting it to be off, or you cannot find any such device on your installation, contact your installer to confirm whether it is expected or needs a service visit. Do not force or dismantle the device.
Powerwall Disabled — Service Required Internal fault — contact installer
An internal fault has been detected and the Powerwall has shut itself down. This is one of the most serious alerts. Common causes include an internal cell failure, a DC stage fault in the power conversion hardware, or a ground fault detected during the insulation self-test. Turn off the enable switch and contact your installer or Tesla support. This typically requires a site visit and may result in a warranty replacement — a power cycle will not fix it.
Solar Production LimitedAlert · solar fault
The Tesla app banner reads "Service Required - Fault Detected". Tesla's description is that one of your inverters may not be producing solar due to a fault detected with your solar system. On Powerwall+ and Powerwall 3 this points at the integrated solar inverter. Tesla's official guidance is to contact your installer to schedule a site visit. Before you do, note what the app shows for solar production (zero, or just reduced), whether the alert appeared after a storm or a firmware update, and whether the LED state on the unit has changed. Do not touch DC isolators or wiring. A remote review of the app data can often tell whether it is one string, the whole inverter, or a monitoring artefact before anyone books a visit.
Low Energy LockoutUnofficial name · battery ran flat
"Low Energy Lockout" is widely used by owners and installers, but it is not an alert name Tesla uses in the app or in its official support documentation. When a Powerwall runs flat during an extended power cut, the alerts you will actually see are Tesla's three-step sequence, covered later in this section: "Waiting for Solar", then "Waiting for User Input", then "Waiting for Grid". The underlying concern is real. Tesla's own Powerwall 3 documentation warns that a battery allowed to drain to 0% state of energy cannot be recovered without intervention, which is why the system shuts itself down and waits rather than running completely flat. If your Powerwall has sat empty and will not restart once the grid returns, stop power cycling it and contact your installer or Tesla support promptly.
Powerwall Low EnergyAlert · informational
The Powerwall charge level is low. If you are off-grid during a power cut, reduce household loads to extend your backup duration. In normal grid-connected operation, this alert means the battery has discharged to near the backup reserve threshold and will stop discharging to preserve backup capacity. The system will recharge from solar or the grid depending on your mode settings. No action needed unless you are in a power cut.
Powerwall Very Low EnergyAlert · urgent
The Powerwall is critically low on energy with very limited backup time remaining. Immediately reduce your home's power consumption — switch off non-essential appliances, heating, and high-draw devices. If the grid is still available, the system will recharge. If you are off-grid during a power cut, prioritise only essential loads like lights and the fridge to extend the remaining backup as long as possible.
Waiting for SolarAlert · off-grid shutdown
During an extended power cut the Powerwall has run very low on energy and has stopped providing power. The push notification reads "Powerwall is very low on energy and stopped providing power. Powerwall will resume operation during daylight hours to charge from solar." The system checks hourly and restarts on its own once there is enough solar to power your home and recharge the battery at the same time. Help it succeed by switching off high-draw appliances such as kettles, ovens, immersion heaters, and tumble dryers. Tesla also notes you can restart manually by toggling the on/off switch on the side of the unit once solar is available.
Waiting for User InputAlert · manual restart needed
Sent after "Waiting for Solar" when the hourly automatic retries could not find enough solar to resume operation. The push notification reads "Automatic retries did not have sufficient solar to resume Powerwall operation. Reduce your load and manually resume when solar is present by toggling on/off switch." Turn off everything non-essential, wait for decent daylight on the panels, then toggle the enable switch on the side of the unit (right side on Powerwall 2, left side on Powerwall 3). If it shuts down again straight away, your loads are still too high or solar is still insufficient. If the grid has returned and the system still will not resume, the fault needs proper investigation.
Waiting for GridAlert · battery empty
The final alert in the low-energy sequence, sent after "Waiting for User Input". The push notification reads "Powerwall is empty and has shut down. Powerwall will be unavailable and is waiting for the grid to return." The battery is fully depleted and can no longer restart from solar. This is the designed deep-discharge protection state, so there is nothing to fix on the unit itself. When mains power returns, the Powerwall recharges and resumes automatically. Check the Tesla app a few hours after the grid comes back to confirm charging has resumed. If the grid is back but the unit stays dead, with the LED off and no app data, do not open or probe anything. A unit stuck at 0% can need professional recovery.
Powerwall OverloadedAlert · load management
The load on the backed-up circuit exceeds what the Powerwall can deliver. Each Powerwall unit supports up to 5kW continuous output — if your household demand exceeds this during a power cut, the system overloads and disconnects. You may hear audible clicking as it retries. Reduce the load by switching off high-draw appliances like kettles, ovens, and immersion heaters. The Powerwall will automatically retry within two minutes once the load drops. In multi-Powerwall systems, the combined output is higher but the total load must still stay within the aggregate rating.
Calibration in ProgressAlert · maintenance
"Calibration in Progress" is the banner name Tesla uses in the app; owners often shorten it to calibrating. The Powerwall is performing a routine battery calibration. During calibration, the system may charge and discharge the battery through a full cycle to recalibrate the state-of-charge reading. This can take up to 24 hours and is normal maintenance behaviour. The SOC percentage in the app may appear inaccurate during this period. No action required — the system will return to normal operation after calibration completes.
Storm WatchAlert · informational
A severe weather event has been forecast for your area and the Powerwall is charging to maximum capacity to prepare for a potential power cut. Storm Watch temporarily overrides your normal operating mode and prioritises backup readiness. Once the storm warning passes, the system returns to your previous settings. This is an automatic feature that can be enabled or disabled in the Tesla app under Powerwall settings.
Battery & thermal faults

Battery faults relate to the internal cells, temperature management, and power conversion hardware inside the Powerwall unit. Tesla's BMS monitors cell voltages, temperatures, and insulation resistance continuously. Most battery faults require professional attention — the Powerwall is a sealed unit and not user-serviceable.

Internal Fault / Battery Fault Sealed unit — professional service required
The Powerwall's internal diagnostics have detected a fault within the battery pack or power electronics. This could be a cell failure, a manufacturing defect that has developed over time, or degradation. The Tesla app may show "Internal Fault Detected" or "Battery Fault". Turn off the enable switch on the side of the unit. The Powerwall is a sealed, non-serviceable unit — do not attempt to open it. Contact your installer to initiate a warranty claim with Tesla.
Battery Over-temperatureThermal · environment
The internal battery temperature has exceeded the safe operating limit. The Powerwall has an integrated liquid cooling system, but in extreme ambient heat or if the cooling circuit fails, the cells can overheat. Check that the unit is not in direct sunlight and has adequate clearance for airflow. The Powerwall's operating range is -20°C to 50°C. If the installation location routinely exceeds this, the unit may need relocating. The system will resume once the temperature drops.
Battery Under-temperatureThermal · cold weather
The battery temperature is below the minimum for safe charging. Powerwall has a built-in heater that activates in cold conditions, but in extreme cold the heater may not raise the temperature fast enough. The system will wait until the cells reach a safe temperature before resuming charge. Discharge may continue at a reduced rate in cold conditions. If the unit is installed outdoors or in an unheated outbuilding in the UK, sub-zero winter nights can trigger this regularly.
DC Stage Fault Power conversion failure
The DC-to-AC power conversion stage inside the Powerwall has failed. This is the inverter circuitry that converts stored DC energy into usable AC power. A DC stage fault means the Powerwall cannot charge or discharge. This is a hardware failure that requires professional service — typically a warranty replacement of the unit. Turn off the enable switch and contact your installer.
Isolation Self-Test FailureSafety · insulation
The Powerwall performs periodic insulation resistance self-tests to verify there is no earth leakage path. A failure means the measured resistance is below the safety threshold. This can be caused by moisture ingress (rare on sealed units), internal wiring degradation, or a genuine insulation fault. The system will disable itself until the test passes. If it does not resolve within 24 hours, contact your installer — the unit may need inspection or replacement.
Powerwall BalancingMulti-unit · normal
In multi-Powerwall installations, the system is balancing the charge level between units. This is normal behaviour that occurs automatically when the state of charge differs significantly between Powerwall units. Balancing typically takes up to six hours and completes without intervention. During balancing, the system may temporarily reduce its available capacity. No action required.
Gateway & communication faults

The Backup Gateway 2 (or Backup Switch on Powerwall 3) is the brain of the system — it manages grid switching, energy monitoring, and cloud connectivity. If the Gateway goes offline, you lose monitoring and some control features, but the Powerwall typically continues operating locally.

Gateway OfflineCommunication · network
The Gateway has lost its internet connection. The Tesla app shows a greyed-out or blank power flow screen, and the Gateway may be making a beeping sound. Check that your router is working and the internet connection is active. Verify the Ethernet cable between the Gateway and router is firmly plugged in at both ends (if using wired connection). If connected via Wi-Fi, check the Gateway has not lost the Wi-Fi password after a router change. Press the reset button on the Backup Gateway 2 to restart the network connection.
Communication Error / No DataCommunication · PW to Gateway
The Powerwall cannot communicate with the Gateway or the Tesla cloud. The LED on the Powerwall will be flashing green. The system may still charge and discharge locally, but you will not see live data in the app. Restart the Gateway by pressing the reset button or by turning off the Gateway breaker for 30 seconds. If the Gateway Wi-Fi network name or password has changed since installation, you may need to reconnect the Gateway via the Tesla app's Wi-Fi settings.
Gateway BeepingCommunication · offline
The Gateway is audibly beeping, indicating it has lost connectivity. This is a deliberate audio alert to tell you the system is offline. Check the internet connection and Gateway power supply. If the Gateway has power but continues beeping after verifying the internet connection, try a full power cycle — turn off the Gateway breaker, wait 30 seconds, then turn it back on. Persistent beeping after a power cycle may indicate a hardware fault in the Gateway's communication module.
Firmware Update in ProgressSystem · update
Tesla pushes firmware updates automatically over the internet. During an update, the Powerwall LED may flash red and the system may be temporarily unavailable. Do not turn off the Powerwall or Gateway during a firmware update — interrupting the process can leave the system in a partially updated state that requires professional recovery. Updates typically complete within 30 minutes. If the update appears stuck for more than two hours, contact Tesla support.
Firmware Update FailedSystem · software
A firmware update did not complete successfully. The system may repeatedly go offline for brief periods while retrying the update. Ensure the Gateway has a strong, stable internet connection — updates can fail over weak Wi-Fi. If using Wi-Fi, consider connecting the Gateway via Ethernet for the duration of the update. If the update continues to fail after ensuring good connectivity, contact Tesla support — they can push the update remotely or schedule a service visit.
Grid & backup faults

Grid and backup alerts relate to how the Powerwall interacts with the mains supply and provides emergency backup power during outages. The Backup Gateway continuously monitors grid voltage and frequency and will island your home (disconnect from the grid) if conditions fall outside safe parameters.

Going Off-Grid / Island DetectedGrid · power cut
The Powerwall has detected a grid outage or grid voltage/frequency outside safe limits and has disconnected your home from the mains. Your home is now running entirely on Powerwall battery and solar (if available). This is normal backup behaviour. The Powerwall may discharge below your set backup reserve during an extended outage. Reduce household loads to extend backup duration. The system will automatically reconnect to the grid when it detects stable power has returned.
Grid Out of ComplianceGrid · voltage or frequency
The grid voltage or frequency is outside the Powerwall's compliance window but has not fully dropped out. The system may hesitate to island or may island briefly and reconnect. If you notice the Powerwall did not activate during a power cut, "grid out of compliance" conditions just before the outage may have prevented the transfer. This is a known edge case — the system needs a clean transition. If your grid supply is consistently unstable, contact your DNO to report the issue.
Backup Failed / No Backup During OutageBackup · did not activate
The grid went down but the Powerwall did not provide backup power. Possible causes include the Powerwall having insufficient charge (below the backup reserve), the Gateway transfer switch failing to island the home, or a breaker being open on the backup circuit. Check that the Powerwall was charged above the backup reserve threshold at the time of the outage. Verify the Gateway breaker and Powerwall breaker are both on. If the system was charged and breakers were on but backup still failed, the Gateway transfer switch may need investigation.
Grid ReconnectedGrid · informational
The grid supply has returned and the Powerwall has reconnected your home to the mains. The system will resume its normal operating mode — self-powered, time-based control, or whatever mode you had selected. The Powerwall will begin recharging from solar or grid depending on settings. No action required. This notification confirms the power cut is over and your system is back to normal.
Powerwall 3 solar-specific faults

Powerwall 3 has an integrated solar inverter, so it has additional fault types related to PV strings that Powerwall 2 does not have. These faults only appear on Powerwall 3 and Powerwall+ systems where solar panels connect directly to the unit.

Arc Fault Detected DC arc — safety shutdown
The Powerwall 3's arc fault circuit interrupter (AFCI) has detected a potential DC arc on a solar string. This is a fire safety mechanism. The system shuts down the affected string. Inspect the DC wiring for damaged cables, loose MC4 connectors, burn marks, or poor junction box connections. If five arc fault alerts occur within 24 hours, the system enters Arc Fault Lockout — a full inspection of the DC wiring must be performed before the system can be re-enabled. Do not ignore arc faults — they indicate a genuine fire risk.
Arc Fault Lockout Repeated arcs — system locked
Five or more arc fault alerts have occurred within 24 hours. The system has entered lockout mode and will not restart until the DC wiring has been professionally inspected and the issue remediated. A qualified electrician or solar engineer must physically inspect every MC4 connection, cable run, isolator, and junction box on the affected string. After repair, the lockout must be cleared through the commissioning tool. This is not a reset-and-hope situation — the underlying wiring fault must be found and fixed.
PV Input OvervoltageSolar · string voltage
The open-circuit voltage on a PV string connected to the Powerwall 3 exceeds the maximum DC input rating. Too many panels are connected in series on that string. Measure the string Voc with a multimeter — on cold mornings, voltage rises significantly. If the measured voltage exceeds the Powerwall 3's rated maximum, the string must be reconfigured with fewer panels in series. Do not continue operating with an over-voltage string — it can damage the internal inverter hardware.
PV Ground FaultSolar · insulation
A ground fault has been detected on the PV array connected to the Powerwall 3. The insulation resistance between the solar string and earth is below the safety threshold. Check DC cables for physical damage, inspect MC4 connectors for moisture ingress, and examine the cable runs for anything that could compromise insulation. If the fault only appears in wet weather, a connector joint or cable entry point is the likely culprit. Disconnect strings individually to isolate which one has the fault.
Powerwall 3 commissioning & system states

These alerts and states are specific to Powerwall 3 and surface in Tesla One, the installer's commissioning tool, rather than in the owner app. They matter to homeowners because the visible symptom is usually a unit that looks dead, will not start, or produces nothing from one solar string. None of them is owner-serviceable, but knowing the name helps you have an informed conversation with your installer.

MCI Self-Test FailurePW3 · string safety switch
A commissioning alert shown in Tesla One as "Alert: MCI Self-Test Failure". The Powerwall 3 is failing the self-test of an MCI (mid-circuit interrupter), the rapid-shutdown safety switch Tesla fits to every PV string, including on UK systems where rapid shutdown rules do not apply. Tesla's documented symptom is a string that shows voltage during the self-tests but then sits greyed out at 0V once they complete, so to an owner this usually presents as one string producing nothing. The fix is installer work: Tesla provides MCI diode and resistance health tests plus an open-air voltage test to identify the faulty MCI, which is then replaced. Do not touch the DC string wiring. Note which string shows nothing in any data you can see and contact your installer.
Inverter Relay Self-Test FailurePW3 · inverter relay
A commissioning alert shown in Tesla One as "Alert: Inverter Relay Self-Test Failure". The Powerwall 3 is failing the self-test of the relay that connects its integrated inverter to the AC side. Tesla's documented troubleshooting is installer-side: confirm the system has been started, perform a Stop System then Start System, and confirm the AC State reads Active during the relay self-test. Likely possibilities include a system that was never started after install or service, an AC-side supply issue, or a genuinely faulty relay inside the sealed unit. If your system is newly installed or just serviced and will not start, contact your installer rather than power cycling repeatedly. Relay faults that persist after the documented stop and start procedure go to Tesla support via the installer.
Sleep StatePW3 · asleep, not dead
Documented Powerwall 3 behaviour rather than a fault. From software version 24.4, a Powerwall 3 enters Sleep when its enable switch is on but the system has been left stopped for more than 10 minutes. This is deliberate: it stops the unit draining its state of energy to 0%, at which point Tesla warns it cannot be recovered. Entering the wait, the logo LED flashes white once a second for 10 minutes; while asleep the logo LED is off, so the unit can look completely dead. It wakes every two hours on its own. If the system has been started it stays awake and resumes; otherwise it goes back to sleep after 10 minutes. The usual cause is a system left stopped after commissioning, service, or a fault shutdown. The fix is for the installer to start the system in Tesla One. It cannot be done from the owner app, so do not keep flipping breakers, and a unit that has sat stopped for a long period should be looked at promptly.
Alert not listed here?

Tesla regularly adds new alerts through firmware updates. If you see a notification in the Tesla app that is not covered above, share the exact alert text and your Powerwall model (2, 3, or +) and we will identify it. Screenshots from the app are especially helpful for diagnosing unusual alerts.

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FAQ

Tesla Powerwall fault questions

Tesla Powerwall does not display traditional numbered fault codes. Instead, it uses two methods: the Tesla app shows plain-English alert messages like "Powerwall Disabled", "Breaker Open", or "Waiting for Solar", and the LED indicators on the unit show status through colour and pattern. Solid green = standby, pulsing green = active, flashing green = no Gateway communication, flashing red = fault or firmware update. Check both the app notifications and the LED when troubleshooting.
"Powerwall Disabled — Service Required" means an internal fault has been detected that prevents the unit from operating. Common causes include cell failure, a DC stage fault, or a ground fault during insulation self-testing. Turn off the enable switch on the side of the unit and contact your installer or Tesla support. This typically requires a site visit and may result in a warranty replacement — a power cycle will not fix it.
Flashing green means the Powerwall is enabled but cannot communicate with the Gateway. Check your internet connection, restart the router, and verify the Gateway has power. Try pressing the reset button on the Backup Gateway 2 (behind the small cover on the front). If flashing green persists after a Gateway reset and the internet is confirmed working, the communication link between the two devices may have a hardware fault that needs professional investigation.
STS offers remote diagnostic assessments from free. Powerwall systems log detailed data including charge cycles, temperature history, and alert logs. We review your Tesla app data and system configuration remotely to identify the root cause and advise whether you need a Tesla warranty claim, a Gateway reset, an electrical check, or a site visit. We are independent from Tesla and provide an unbiased assessment.
Powerwall 2 is an AC-coupled battery that pairs with a separate solar inverter. Powerwall 3 is a hybrid unit with a built-in solar inverter — it connects directly to PV panels as well as the battery. Powerwall 2 uses a Backup Gateway 2 for grid switching. Powerwall 3 uses a Backup Gateway 2 (the Backup Switch sold in some markets is not offered in the UK). It shows alerts through the Tesla app, but Powerwall 3 has additional fault types related to its integrated solar inverter — including arc fault detection and PV string monitoring.
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