- Solar and energy
- Solar inverter
IQ Battery Red Double Flash
Enphase storage IQ Battery Red Double Flash: fault shutdown
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
A red double flash LED pattern (red flashes in sequences of 2) on an Enphase IQ Battery 5P means the unit is in an error state. Check the Enphase App status, switch off heavy appliances if an off-grid overload occurred, and contact Enphase Support to troubleshoot the issue.
Safety first
Stop and check this first
- Risk of electric shock: do not attempt to repair the IQ Battery 5P or open the unit under the cover; it contains no user-serviceable parts and opening it will void the warranty.
- Only qualified electricians should install, troubleshoot, or replace the IQ Battery, always de-energising the AC branch circuit and turning the DC switch OFF before servicing.
Safe checks you can perform
- Check battery state of charge and alerts in the Enphase App
- Check the IQ Gateway LEDs and internet connection
- Cycle the external IQ Battery 5P DC switch if it does not recover on its own
Leave these tasks to a qualified professional
- Do not attempt this professional task: Remote fault log diagnosis with Enphase Support and CTRL/AC circuit check
- Do not attempt this professional task: Field-replaceable part replacement or RMA via trained service personnel
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Remote fault log diagnosis with Enphase Support and CTRL/AC circuit check
What they doThe certified installer contacts Enphase Support with the LED states of the IQ Battery 5P and IQ Gateway, inspects the wired CTRL communication link, and checks the AC branch circuit.
They must show youthe diagnostic event log in the Enphase Installer Platform and the measured AC branch circuit voltage.
In writingthe Enphase Support case number, the logged fault code, and the verified status of the IQ Gateway communication link.
Field-replaceable part replacement or RMA via trained service personnel
What they doAfter isolating AC power by de-energising the AC supply, confirming with a multimeter that no AC power is present, and placing the DC switch in OFF, trained service personnel replace the faulted part or process an RMA.
They must show youthe 0 Vac multimeter confirmation prior to opening the wiring cover and normal blue or green LED operation after repair.
In writingthe RMA number or Enphase Support authorisation and the serial number of any replaced component.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Check battery state of charge and alerts in the Enphase App
- Who:
- you, checking the Status and Live Status screens in the Enphase App.
- How:
- check whether the Enphase App shows a state of charge greater than 2% and whether the shutdown happened right after a large appliance or motor (air conditioner, dryer, oven, or pump) started up.
- Result that matters:
- determining whether an excessive electrical load overloaded the batteries during a grid outage.
- If you suspect a heavy load overloaded the batteries:
- immediately shut OFF that load; the owner's guide notes the system restarts within 5 minutes.
- If no large loads were running or the grid is available:
- proceed to check the IQ Gateway LEDs.
- Evidence to keep:
- screenshots of the Enphase App Status and Live Status screens showing state of charge.
Evidence: Enphase Energy System with IQ Battery 5P owner's guide, USG-00017-3.0 · IQ Battery 5P with FlexPhase Quick install guide, 140-00405-06
Check the IQ Gateway LEDs and internet connection
- Who:
- you, looking at the IQ Gateway or IQ Combiner 5/5C LEDs from outside.
- How:
- verify whether the Network communications LED on the IQ Gateway is lit solid green and whether the IQ Gateway LEDs are flashing (which indicates the system is in the process of restarting).
- Result that matters:
- ruling out an IQ Gateway power or communications loss as the reason the battery stopped operating.
- If the Enphase App shows a wireless communications failure between components:
- give the system 15 to 20 minutes to recover on its own.
- If more than 20 minutes have elapsed without recovery or the IQ Gateway is already solid green:
- move to the next check.
- Evidence to keep:
- a photo of the IQ Gateway LED indicators and the Enphase App device status.
Evidence: Enphase Energy System with IQ Battery 5P owner's guide, USG-00017-3.0 · IQ Battery 5P with FlexPhase Quick install guide, 140-00405-06
Cycle the external IQ Battery 5P DC switch if it does not recover on its own
- Who:
- you, only if the battery fails to recover automatically and without removing the cover, as documented on page 26 of the owner's guide.
- How:
- the owner's guide states you can turn ON/OFF the DC switch for IQ Battery 5P without removing the cover: turn the DC switch OFF, wait 30 seconds, and turn it back ON.
- Result that matters:
- resetting the battery when it does not automatically recover from an overload or failure scenario.
- If the LED flashes yellow during boot-up and then becomes solid or pulsing blue or green:
- normal operation has resumed.
- If the red double flash state persists or returns:
- do not open the unit under the cover and contact Enphase Support and your installer.
- Evidence to keep:
- a short video of the red double flash sequence and the time you performed the 30-second DC switch reset.
Evidence: Enphase Energy System with IQ Battery 5P owner's guide, USG-00017-3.0 · IQ Battery 5P with FlexPhase Quick install guide, 140-00405-06
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Solar and energy
- Brand
- Enphase
- Product type
- Solar inverter
Known code variants
- Enphase battery red double flash
- IQ Battery 5P is in an error state
- IQ Battery 5P Red Double Flash
- La IQ Battery 5P está en estado de error
- LED rojo en secuencias de 2 destellos Enphase
- Parpadeo doble en rojo IQ Battery 5P
- Red flashes in sequences of 2
What it means
In the Enphase IQ Battery 5P with FlexPhase Quick Install Guide (140-00405-06) and the IQ Battery 5P Owner's Guide (USG-00017-3.0), a 'Red double flash' ('Red flashes in sequences of 2') LED state means the IQ Battery 5P is in an error state and instructs contacting Enphase Support to troubleshoot the issue. The owner's guide explains that system shutdowns or failure states may be caused by a large electrical load overloading the batteries during an outage (when state of charge exceeds 2%), a communications failure with the IQ Gateway, or an equipment fault. Seeing a red double flash by itself does not prove that the entire battery unit must be replaced.
Warnings and stop conditions
- Highsource verified
Risk of electric shock: do not attempt to repair the IQ Battery 5P or open the unit under the cover; it contains no user-serviceable parts and opening it will void the warranty.
Evidence: Enphase Energy System with IQ Battery 5P owner's guide, USG-00017-3.0 · IQ Battery 5P with FlexPhase Quick install guide, 140-00405-06
- Highsource verified
Only qualified electricians should install, troubleshoot, or replace the IQ Battery, always de-energising the AC branch circuit and turning the DC switch OFF before servicing.
Evidence: Enphase Energy System with IQ Battery 5P owner's guide, USG-00017-3.0 · IQ Battery 5P with FlexPhase Quick install guide, 140-00405-06
Symptoms and causes
Probable causes · in order
- Large electrical load or motor surge overloading the batteries off-gridCommon
The owner's guide notes that if the Enphase App shows greater than 2% state of charge during an outage, high-surge appliances such as air conditioners, electric dryers, ovens, or well pumps can collapse the microgrid.
Evidence: Enphase Energy System with IQ Battery 5P owner's guide, USG-00017-3.0
- Communication loss with the IQ Gateway or unrecovered fault statePossible
Prolonged loss of communication with the IQ Gateway while off-grid or a latched fault condition prevents battery operation until communication recovers or the DC switch is cycled.
Evidence: Enphase Energy System with IQ Battery 5P owner's guide, USG-00017-3.0 · IQ Battery 5P with FlexPhase Quick install guide, 140-00405-06
- Internal fault in a field-replaceable part of the IQ Battery 5PPossible
The LED overview table defines Red double flash as an IQ Battery 5P error state that requires contacting Enphase Support and, if needed, service by trained personnel.
Evidence: Enphase Energy System with IQ Battery 5P owner's guide, USG-00017-3.0 · IQ Battery 5P with FlexPhase Quick install guide, 140-00405-06
Virtual technician
Does IQ Battery Red Double Flash still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Enphase Energy System with IQ Battery 5P owner's guide, USG-00017-3.0
Enphase Energy · 2024 · manual
- 2
IQ Battery 5P with FlexPhase Quick install guide, 140-00405-06
Enphase Energy · 2026 · manual
- 3
IQ Battery 5P with FlexPhase Guía de instalación rápida, 140-00405-04
Enphase Energy · 2025 · manual
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