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.
Sungrow Inverter Code 036 — Why Your Radiator Is Overheating
Code 036 means the inverter's power module — the IGBT assembly bolted to the internal radiator/heatsink — has gotten too hot. Sungrow's manual describes it as 'temperature anomaly: the temperature of the power module is excessively high and out of the safe range.' It is a shutdown fault: the inverter stops to protect its electronics and restarts automatically once the module cools. The usual suspects are poor ventilation, direct sun, dirty air ducts, or defective cooling fans (which would show up as code 070). Check shade and airflow first; if the fault repeats in good conditions, call Sungrow service.
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?
Is your system producing power right now?
What this code means
The power module is where the hard work happens: insulated-gate bipolar transistors switching thousands of times per second to shape DC into grid-quality AC. That switching generates waste heat, which flows into a chunky aluminum radiator — the finned heatsink on the unit. Code 036 is the temperature sensor on that module reporting that the heat is not getting away fast enough. Sungrow classifies it as a shutdown-type fault: rather than limping along, the inverter stops completely until the module temperature falls back into the safe range, then restarts on its own.
Sungrow's own documentation gives you a tidy diagnostic ladder for this code. The SG-series manuals list the checks in order: is the inverter in direct sunlight (if so, add shading), are the air ducts clean, and is there a 070 fan-anomaly alarm alongside it (if so, replace the fans). The Distribution Europe academy adds that the fault condition is the temperature of one or more IGBT modules differing from the others, with troubleshooting running through the fan self-check, then the module itself. Notice the pattern — 036 is very often the symptom and something in the cooling path is the disease. Finding which part of the cooling path is failing is the whole job.
What is this downtime costing you?
Rough estimate while your system isn't producing. Adjust the numbers to match your setup.
≈ – 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 location — the inverter mounted in a dead-air spot or with blocked clearances so hot air recirculates around the radiator.
- Direct sunlight on the unit, adding many degrees to the module temperature on top of an already hot day.
- Dirty or blocked air ducts and outlet grills — dust, leaves, and insect nests throttling the airflow the radiator depends on.
- Defective cooling fans (Sungrow code 070): if the fans are not moving air, the radiator cannot do its job and 036 follows.
- AC output power exceeding the nominal rating for extended periods, or extreme ambient temperatures during heatwaves.
Safe steps to try
Work top to bottom, ticking off each step as you complete it. 0 of 5 done.
Is your inverter still under warranty?
Before paying for a repair, check — your installer may fix this free.
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 Sungrow or your installer if code 036 keeps returning after you have fixed shade, cleaned the ducts, and confirmed good ventilation — particularly if it appears in mild weather or alongside a 070 fan alarm. At that point the likely causes are failed fans, a faulty temperature sensor, or a degraded power module, and Sungrow's academy notes that a large discrepancy between the displayed internal temperature and the actual measured temperature indicates a temperature-sampling fault where inverter replacement is recommended. Fan replacement and any internal work are strictly service jobs. As with all Sungrow faults: if the fault still occurs after the basic checks, contact Sungrow.
Frequently asked questions
What is the difference between code 036 and code 037?
Code 036 is about the power module (the IGBT assembly on the radiator) running too hot. Code 037 is about the ambient air inside the inverter enclosure being too hot. They often appear together on extreme days, but 036 points at the heat source while 037 points at the environment.
Will the inverter restart by itself after 036?
Yes. It is a shutdown fault with automatic recovery: the inverter waits until the module temperature is back in the safe range and then restarts. No manual reset is required.
I also see code 070. Which do I fix first?
The 070 — defective fans. Without working fans the radiator cannot shed heat, so 036 is the inevitable consequence. Fix the cooling and the overtemperature fault should stop appearing.
Can I clean inside the inverter to help cooling?
No. Only the external air ducts, outlet grills, and the outside of the unit are yours to clean. The inside is a sealed, live enclosure with no user-serviceable parts.
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 — Sungrow SG250HX User Manual, Section 9 'Troubleshooting and Maintenance' — Fault code 036: 'Temperature anomaly: the temperature of the power module is excessively high and out of the safe range'; check method: shading, clean air ducts, check for 070 fan anomaly. Academy of Sungrow Distribution Europe, 'Fault codes and troubleshooting steps 031-040': 'Module overtemperature (fault code 036)'.