- Solar and energy
- Solar inverter
IQ Battery Solid Yellow LED
Enphase storage IQ Battery Solid Yellow LED: high temp pause
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
A solid yellow status light (IQ Battery Solid Yellow LED) on an Enphase IQ Battery 5P indicates that the battery is not operating due to high temperature. Check the room temperature, increase cooling or ventilation, and ensure at least 15 cm (6 in) of clearance around the unit.
Safety first
Stop and check this first
- Do not place beverages or liquid containers on top of the IQ Battery or use cleaning solvents: use only a dry or slightly water-dampened cloth on the exterior when safe.
- In case of unusual noise, a sweet odour, or smoke from the IQ Battery 5P, ensure nothing is in the venting area, ventilate the room, never touch leaked electrolyte, and contact emergency services and Enphase Support.
Safe checks you can perform
- Check the temperature in the room and increase cooling or ventilation
- Verify at least 15 cm (6 in) of clearance at the bottom, top, and sides
- Check whether the LED returns to blue or green and verify the Enphase App
Leave these tasks to a qualified professional
- Do not attempt this professional task: Thermal telemetry diagnostics and site review with Enphase Support
- Do not attempt this professional task: Replacement of field-replaceable parts by 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.
Thermal telemetry diagnostics and site review with Enphase Support
What they doThe certified installer contacts Enphase Support to inspect internal temperature logs for the IQ Battery 5P and checks that the installation site meets ambient temperature (-20 °C to 55 °C) and clearance requirements.
They must show youthe battery status and temperature telemetry reported via the IQ Gateway in the Enphase platform.
In writingthe Enphase Support case number, recorded internal temperatures, and any site ventilation improvements required.
Replacement of field-replaceable parts by trained service personnel
What they doIf Enphase Support identifies a faulty internal component, trained service personnel isolate AC power, confirm zero AC voltage with a multimeter, turn the DC switch OFF, and replace the authorised part.
They must show youmultimeter verification of de-energised AC supply before service and normal blue/green LED operation afterwards.
In writingthe Enphase Support authorisation, the field-replaceable part serial number, and the post-service commissioning check.
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 the temperature in the room and increase cooling or ventilation
- Who:
- you, checking the room or garage where the IQ Battery 5P is installed.
- How:
- follow step 1 of the Enphase troubleshooting guide: check the ambient temperature in the room and increase cooling and/or ventilation by opening vents, doors, or air conditioning.
- Result that matters:
- lowering the surrounding air temperature so the IQ Battery 5P can exit its high-temperature pause.
- If the room was warm and cools down once ventilated:
- allow the battery time to cool and watch the front LED.
- If the room is already cool and well-ventilated:
- proceed to check the physical clearances around the unit.
- Evidence to keep:
- the approximate room temperature and the time when the solid yellow LED was observed.
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
Verify at least 15 cm (6 in) of clearance at the bottom, top, and sides
- Who:
- you, doing an external visual inspection without removing any covers.
- How:
- check that the bottom, top, and sides of the IQ Battery 5P have at least 15 cm (6 in) of clearance from walls or stored items, and ensure nothing rests on top of the unit or blocks its vents.
- Result that matters:
- ensuring unobstructed natural airflow across the battery enclosure.
- If objects were stored within 15 cm (6 in) or resting on top of the battery:
- move them away without poking into the vents.
- If all sides already have at least 15 cm (6 in) of clear space:
- let the unit cool and check the Enphase App.
- Evidence to keep:
- a photo showing the clearance around the top, bottom, and sides of the IQ Battery 5P.
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 whether the LED returns to blue or green and verify the Enphase App
- Who:
- you, checking the front LED indicator and the Enphase App.
- How:
- watch whether the LED changes from solid yellow back to blue or green once cooled, and verify that the IQ Gateway and internet connection are working so battery status updates in the Enphase App.
- Result that matters:
- confirming that the IQ Battery 5P has resumed normal operation.
- If the LED turns blue or green and live status is normal in the Enphase App:
- the thermal pause has cleared.
- If the solid yellow state persists after cooling the room or changes to flashing red:
- contact Enphase Support and your installer.
- Evidence to keep:
- a screenshot of the Enphase App status page and the current LED color on the front cover.
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
- Amarillo fijo: No funciona debido a la alta temperatura
- Batería Enphase luz amarilla fija
- Enphase battery solid yellow light
- IQ Battery 5P amarillo fijo
- IQ Battery 5P Solid Yellow LED
- IQ Battery Solid Yellow
- LED amarillo fijo IQ Battery 5P
- Solid yellow: Not operating due to high temperature
What it means
In the Enphase IQ Battery 5P with FlexPhase Quick Install Guide (140-00405-06) and the Enphase Energy System with IQ Battery 5P Owner's Guide (USG-00017-3.0), a 'Solid yellow' LED state means 'Not operating due to high temperature'. The battery pauses charging and discharging when ambient heat or blocked airflow pushes internal temperatures beyond normal operating limits (Enphase specifies keeping the battery in a well-ventilated area within -20 °C to 55 °C, or -15 °C to 55 °C in the owner's guide, out of direct sunlight and with at least 15 cm / 6 in of wall clearance). A solid yellow LED alone does not prove that the battery hardware is defective.
Warnings and stop conditions
- Mediumsource verified
Do not place beverages or liquid containers on top of the IQ Battery or use cleaning solvents: use only a dry or slightly water-dampened cloth on the exterior when safe.
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
In case of unusual noise, a sweet odour, or smoke from the IQ Battery 5P, ensure nothing is in the venting area, ventilate the room, never touch leaked electrolyte, and contact emergency services and Enphase Support.
Evidence: IQ Battery 5P with FlexPhase Quick install guide, 140-00405-06
Symptoms and causes
Probable causes · in order
- High room temperature or insufficient cooling and ventilationCommon
Enphase's first troubleshooting step for a battery paused by temperature is to check the temperature in the room and increase cooling and/or ventilation as required.
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
- Less than 15 cm (6 in) clearance or blocked venting areasCommon
The manual instructs checking that the bottom, top, and sides of the IQ Battery 5P have at least 15 cm (6 in) clearance from the wall and that vents are not blocked.
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
- Direct sunlight exposure, nearby heat sources, or internal thermal sensor faultPossible
Mounting the battery in direct sunlight or near heat sources raises enclosure temperature, while a persistent solid yellow LED in a cool room requires Enphase Support diagnosis.
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 Solid Yellow LED 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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