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Solis OV-TEM: Over Temperature

Updated June 2026 · Reviewed for technical accuracy · ~3 min read

OV-TEM (over temperature, code 1032) means the temperature inside your Solis, near the power electronics (IGBTs), rose above the safe limit, so the inverter throttled down or shut off to avoid damage. It is a protective response, and almost always about cooling and airflow rather than a broken part.

Why a Solis overheats, most common first

  • Poor ventilation or direct sun. It is in a hot, enclosed spot or taking direct sunlight on the casing.
  • Dust or blockage. The heatsink or fan vents are clogged with dust or debris.
  • Midday heat at full output. Peak sun plus a hot day plus maximum power pushes it over the limit.
  • Something covering or crowding the unit, trapping heat.

How to fix it safely

Let it cool first The casing can be hot during a thermal fault. All steps are external; don't open the unit.
  1. Power it down and wait about 15 minutes so the temperature drops back to a safe level.
  2. Give it space and air. Make sure nothing is covering it and clear room around it so air can move freely.
  3. Get it out of the sun. If sunlight hits the unit, shade it or plan to relocate it somewhere cool and ventilated.
  4. Clean the vents and heatsink. With it off, gently clear dust from the external vents. Don't open the case.
  5. Restart and watch. If OV-TEM stays away through the next hot part of the day, it is solved.

Quick decision flowchart

OV-TEM appears
↓ cool down 15 min, uncover, improve airflow, clean vents
✅ Stays clear through midday heat → solved. Keep it ventilated and shaded.
❌ Returns with good airflow and a clean, shaded unit → fan or sensor fault.
↓
If it keeps returning despite good cooling, contact your installer or Solis service.

Stop it coming back

OV-TEM is often a siting problem. The lasting fix is a cool, shaded, well-ventilated location with clear space around the unit. The manual also notes a maximum ambient temperature; a sun-baked spot pushes the inverter past it.

Related Solis codes

RelayChk-FAIL, Relay self-check GRID-INTF, Grid interference OV-G-V, Grid overvoltage

FAQ

OV-TEM only happens around midday.

That is the classic sign of marginal cooling: peak sun, peak output and peak ambient heat all at once. Improve ventilation and shade. If it persists at midday, the location or the fan is the limit.

Is OV-TEM dangerous?

The fault itself is the inverter protecting itself, which is good. The long-term risk is that running hot repeatedly shortens component life, so fix the cooling rather than ignoring it.

Sources

  • Solis inverter alarm-code list (OV-TEM = internal temperature near IGBTs over the limit; lower ambient temperature, restart after 15 minutes).
  • Solis installer documentation.
⚠️ Safety disclaimer. Solar inverters carry lethal DC and AC voltage even when "off", and the casing can be hot during a thermal fault. This guide covers external steps only. Never open the unit or work on wiring unless qualified. When in doubt, call a licensed installer or electrician.