Maintenance & Issues3 min read1 views
How to Troubleshoot a Solar Inverter That Won't Turn On (2026 Guide)
No display, no output, blinking fault light? Work through this safe 2026 troubleshooting sequence before you call for service — many fixes are simple.
BySolarBazaar TeamNo display, no output, blinking fault light? Work through this safe 2026 troubleshooting sequence before you call for service — many fixes are simple.
## Stay safe first
Solar strings carry lethal DC voltage even in daylight. Never open the inverter casing. Everything below is limited to switches, breakers and reading the display — anything more needs a qualified technician.
## The troubleshooting sequence
1. Confirm the AC breaker and DC isolator are both switched ON.
2. Check the grid supply
is present — many inverters won't run without it.
3. Read the error code on the display and note it down.
4. Verify the DC string voltage is within the inverter's start-up window.
5. Power-cycle: turn DC off, then AC off, wait five minutes, and restart in reverse order.
## When to call for help
If the fault code persists after a clean restart, or you see burning smells, tripped RCDs or damaged cabling, stop and call your installer. Note the code and any recent weather events to speed up the fix.
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