- Solar and energy
- Solar inverter
Cavity Overtemperature
GoodWe Cavity Overtemperature on inverter: internal heat
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
GoodWe's Cavity Overtemperature fault (or F35 Cabinet Overtemperature on the EH series) warns that the inside of the hybrid inverter is too hot. Do not touch the hot case: check airflow and room heat from outside, let the unit cool, and call the installer if the fault stays.
Safety first
Stop and check this first
- Do not touch the enclosure or heat sink when Cavity Overtemperature or F35 is active, and never open the inverter: live voltages and hot surfaces require a full shutdown and discharge wait by a professional.
Safe checks you can perform
- Verify the fault name in SolarGo or SEMS and the FAULT LED
- Check room ventilation and ambient heat from outside
- Look for dust or debris on the heat sink and air vents
Leave these tasks to a qualified professional
- Do not attempt this professional task: Heat sink cleaning and airflow improvement
- Do not attempt this professional task: Internal cooling fan inspection with the unit de-energized
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.
Heat sink cleaning and airflow improvement
What they doAfter switching off AC, battery and DC disconnects and waiting for discharge and cooling, the technician cleans the heat sink, intake and outlet.
They must show youthe condition of the heat sink and air channels before and after cleaning.
In writingthe ambient temperature measured at the installation point and any ventilation changes made.
Internal cooling fan inspection with the unit de-energized
What they doIf ambient temperature and ventilation are both normal, the service technician inspects the internal fan for power faults, mechanical jamming or wear.
They must show youthe internal fan test result and the SolarGo alarm log running clear of thermal trips.
In writingwhether the internal fan was cleared or replaced and the inverter firmware version.
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.
Verify the fault name in SolarGo or SEMS and the FAULT LED
- Who:
- you, checking the SolarGo or SEMS Portal app and the front LED panel without touching metal parts.
- How:
- confirm that the alarm log shows Cavity Overtemperature or F35 with the FAULT indicator solid on, and note the exact time power conversion stopped.
- Result that matters:
- separating an internal thermal trip from a backup overload (which makes the FAULT LED blink once).
- If Cavity Overtemperature or F35 appears during peak heat:
- move on to checking room airflow.
- If the FAULT light blinks once or a different code is listed:
- follow the guide for that specific fault instead.
- Evidence to keep:
- a screenshot from SolarGo or SEMS showing the fault name, serial number, software version and time.
Evidence: User Manual V2.0-2026-09-20 Hybrid Inverter ET Series / ET Plus Series 5.0-10.0kW and AC-Coupled Inverter BT Series 5.0-10.0kW · User Manual V2.3-2026-05-22 Hybrid Inverter GW3600-EH to GW6000N-EH
Check room ventilation and ambient heat from outside
- Who:
- you, by visual inspection at a safe distance without touching the hot enclosure.
- How:
- see whether the plant room is shut tight in direct sun or boxes are stacked near the GoodWe unit, and open doors or windows to improve air circulation.
- Result that matters:
- checking whether the installation point exceeds the heat dissipation conditions required by GoodWe.
- If the room was hot or stuffy:
- air it out and watch whether the inverter resumes work once cooled.
- If both room temperature and airflow are normal yet the fault remains:
- GoodWe advises contacting the dealer or after-sales service.
- Evidence to keep:
- a nearby room thermometer reading and a wide photo of the clearance around the inverter.
Evidence: User Manual V2.0-2026-09-20 Hybrid Inverter ET Series / ET Plus Series 5.0-10.0kW and AC-Coupled Inverter BT Series 5.0-10.0kW · User Manual V2.3-2026-05-22 Hybrid Inverter GW3600-EH to GW6000N-EH
Look for dust or debris on the heat sink and air vents
- Who:
- you, looking from the outside without opening covers or poking into the vents.
- How:
- GoodWe's routine maintenance table asks for the heat sink, air intake and air outlet to be checked every 6 to 12 months for foreign matter or dust.
- Result that matters:
- spotting an external blockage that traps heat inside the cabinet.
- If lint or dirt is blocking the fins or vents:
- ask your installer to power down the system and clean the cooling path safely.
- If the heat sink and vents look clean:
- an internal fan fault is more likely; book a service visit.
- Evidence to keep:
- external photos of the heat sink fins, air intake and air outlet.
Evidence: User Manual V2.0-2026-09-20 Hybrid Inverter ET Series / ET Plus Series 5.0-10.0kW and AC-Coupled Inverter BT Series 5.0-10.0kW · User Manual V2.3-2026-05-22 Hybrid Inverter GW3600-EH to GW6000N-EH
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
- GoodWe
- Product type
- Solar inverter
Known code variants
- alarma temperatura interna GoodWe ET
- GoodWe Cabinet Overtemperature
- GoodWe Cavity Overtemperature
- GoodWe EH F35 overtemperature
- GoodWe ET Cavity Overtemperature
- GoodWe F35
- GoodWe hybrid inverter overheating fault
- inversor híbrido GoodWe sobretemperatura
- Sobretemperatura del gabinete GoodWe
What it means
In the GoodWe ET, ET Plus and BT Series user manual (V2.0-2026-09-20, fault No. 29) and the EH Series user manual (V2.3-2026-05-22, fault code F35 'Cabinet Overtemperature'), this alarm trips when internal temperature exceeds the allowed limit and the FAULT LED turns solid on. GoodWe lists three causes: poor ventilation at the mounting spot, ambient temperature above 60 °C (or the maximum permitted range), or a fault in the internal cooling fan. The fault code by itself never proves that a component is broken, and other models may label it differently.
Warnings and stop conditions
- Mediumsource verified
Do not touch the enclosure or heat sink when Cavity Overtemperature or F35 is active, and never open the inverter: live voltages and hot surfaces require a full shutdown and discharge wait by a professional.
Evidence: User Manual V2.0-2026-09-20 Hybrid Inverter ET Series / ET Plus Series 5.0-10.0kW and AC-Coupled Inverter BT Series 5.0-10.0kW · User Manual V2.3-2026-05-22 Hybrid Inverter GW3600-EH to GW6000N-EH
Symptoms and causes
Probable causes · in order
- Mounting spot with poor ventilationCommon
GoodWe's first listed cause is that the hybrid inverter is mounted in a cramped or poorly ventilated spot, or its heat sink and air vents are blocked by dust.
Evidence: User Manual V2.0-2026-09-20 Hybrid Inverter ET Series / ET Plus Series 5.0-10.0kW and AC-Coupled Inverter BT Series 5.0-10.0kW · User Manual V2.3-2026-05-22 Hybrid Inverter GW3600-EH to GW6000N-EH
- Ambient temperature above 60 °CPossible
The ET and BT user manual states that the fault trips when ambient heat at the installation point exceeds 60 °C or the maximum allowable operating range.
Evidence: User Manual V2.0-2026-09-20 Hybrid Inverter ET Series / ET Plus Series 5.0-10.0kW and AC-Coupled Inverter BT Series 5.0-10.0kW · User Manual V2.3-2026-05-22 Hybrid Inverter GW3600-EH to GW6000N-EH
- Fault in the internal cooling fanPossible
When the room is cool and well ventilated, both the ET/BT and EH manuals point to an abnormal internal fan (power supply issue, mechanical jam or wear).
Evidence: User Manual V2.0-2026-09-20 Hybrid Inverter ET Series / ET Plus Series 5.0-10.0kW and AC-Coupled Inverter BT Series 5.0-10.0kW · User Manual V2.3-2026-05-22 Hybrid Inverter GW3600-EH to GW6000N-EH
Virtual technician
Does Cavity Overtemperature 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
GoodWe Technologies Co., Ltd. · 2026 · manual
- 2
User Manual V2.3-2026-05-22 Hybrid Inverter GW3600-EH to GW6000N-EH
GoodWe Technologies Co., Ltd. · 2026 · manual
- 3
Manual del usuario V2.3-2026-05-22 Inversor híbrido GW3600-EH a GW6000N-EH
GoodWe Technologies Co., Ltd. · 2026 · manual
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