Warning What does this mean?

Your system is down or running degraded, but this is not an immediate safety danger. Work through the safe steps below.

Huawei Inverter Alarm 2063 — Overtemperature and How to Respond

Alarm 2063 means the inverter cabinet has gotten too hot. Huawei lists three possible causes — poor ventilation at the installation spot, ambient temperature above the allowed limit, or the inverter itself not working properly. Start with the easy checks: clear space around the unit, clear debris from the heatsink area, and get it out of direct sun if you can. The SUN2000 protects itself by reducing output or shutting down, and it recovers as it cools. If ventilation and temperature are both fine and the alarm keeps coming back, that is a dealer or Huawei support call.

What should I do first?

Two quick questions — we'll point you to the right starting point.

Is this code still showing on your inverter's display?

What this code means

Every inverter is a small furnace in disguise: converting DC to AC at 97–98% efficiency still leaves 2–3% of a multi-kilowatt throughput turning into heat inside a sealed box. The SUN2000 watches its internal cabinet temperature, and alarm 2063 ("Overtemperature") is its way of saying the heat is winning. Huawei classifies it as a Minor alarm, which undersells how seriously you should take the underlying condition — the alarm itself is low-drama because the inverter handles it gracefully, first by derating (quietly reducing its power output to make less heat) and, if that is not enough, by shutting down until temperatures fall back into range.

What makes 2063 useful is that it usually points at the installation environment rather than broken hardware. Huawei's manual names the causes in order of likelihood: the unit is installed somewhere with poor ventilation, the ambient temperature around it exceeds the upper threshold, or — the least common case — the inverter itself is not working properly. That ordering is your troubleshooting order too. The vast majority of 2063 alarms happen on hot afternoons, in cramped enclosures, on sun-baked walls, or behind vegetation that has grown up around the unit since installation day.

What is this downtime costing you?

Rough estimate while your system isn't producing. Adjust the numbers to match your setup.

System size (kW) Peak sun hours / day Electricity rate ($/kWh)

–per day

–per week

–per 30 days

≈ – kWh of lost production per day.

Estimate only — assumes ~80% real-world output vs. nameplate. Actual losses depend on weather, shading, panel direction, and your tariff.

Common causes

Poor ventilation at the installation position — the inverter boxed into a tight enclosure, mounted in a dead-air corner, or installed with less clearance than the manual requires.
Ambient temperature exceeding the upper threshold, common during heatwaves or in unventilated sheds, garages, and attics.
Direct afternoon sun beating on the unit, especially on west-facing walls, which can add many degrees above the air temperature.
Blocked heatsink fins or air paths — leaves, dust, cobwebs, or vegetation grown up against the unit since it was installed.
An internal fault: a failed temperature sensor or a cooling-path problem inside the sealed unit (rare, but it is why the manual lists 'the SUN2000 is not working properly' as the third cause).

Safe steps to try

Work top to bottom, ticking off each step as you complete it. 0 of 5 done.

Check the clearances around the inverter — you should be able to see open air on all sides as the manual's installation diagram requires. Move stored items, bins, and garden equipment away from it.
Clear leaves, dust, and cobwebs from the heatsink fins and the area around the unit, working from the outside only. Never open the inverter casing and never spray it with a hose.
If the unit sits in direct afternoon sun, consider a simple shade — an awning or a ventilated shade hood mounted with clearance so air still flows. Do not wrap or box the inverter in.
Note when the alarm occurs: only on the hottest afternoons points to environment; occurring in mild weather points toward an internal problem.
If the alarm persists after you have fixed ventilation and shade, power-cycle the unit using the external AC and DC switches per the manual's procedure, then watch whether the alarm returns.

Is your inverter still under warranty?

Before paying for a repair, check — your installer may fix this free.

Brand Year installed

Based on typical standard warranty terms — always confirm with your warranty card or installer paperwork, as terms vary by model, region, and purchase date.

When to call an electrician

Contact your dealer or Huawei technical support when ventilation and ambient temperature both meet the requirements and the alarm still returns — Huawei's manual gives exactly this as the escalation step, because at that point the likely cause is internal. Treat it as urgent, not routine, if you notice any burning smell, discoloration, or deformation of the casing: switch the system off via the external AC and DC switches and call a professional immediately. Never open the inverter to inspect the inside — there are no user-serviceable parts, and the DC side stays live and dangerous even with the sun down if capacitors are charged.

Frequently asked questions

Is alarm 2063 dangerous?

The alarm itself means the protection is working: the inverter derates or shuts down before heat can damage it. The situation becomes concerning only if the alarm is constant, or if it comes with smells, smoke, or visible damage — then switch off and call a professional.

Why does it only happen on summer afternoons?

That is the worst-case combination: maximum solar output (maximum internal heat) plus maximum ambient temperature, sometimes plus direct sun on the casing. It is the normal physics of the installation, not necessarily a fault.

Can I cool the inverter with water?

No. Never spray the inverter with a hose or pour water on it. It is an electrical device with live DC inside; use shade and airflow, not water.

Will repeated overtemperature alarms damage my inverter?

Occasional derating on extreme days is within design limits. Chronic overheating — weeks of daily 2063 alarms — accelerates aging of the electronics and capacitors, so a persistent pattern is worth fixing properly with shade or relocation by your installer.

Should I turn the system off during a heatwave?

No need to intervene manually. The inverter manages itself: it reduces output or shuts down as needed and restarts automatically when temperatures recover. Just make sure nothing is blocking its airflow.

Need a professional?

This fault may need professional diagnosis. Contact a qualified solar electrician in your area.

Sources: meaning and troubleshooting verified against the manufacturer's documentation — SUN2000-(8KTL, 10KTL, 12KTL, 15KTL, 17KTL, 20KTL)-M0 User Manual, Issue 03 (2019-07-19), Section 7 Maintenance — Alarm 2063 'Overtemperature', Minor: causes 'installed in a place with poor ventilation', 'ambient temperature too high', 'SUN2000 not working properly' (solar.huawei.com).