Fronius SPR-10001f-UNI-US Inverter Stage 3 issue

[Phoenix PV]

Recently installed the subject Inverter with a 9 Kw Sunpower solar panel array. Making power just fine until appx 6700 watts achieved and then limited.
Suspecting the third stage of the unit has failed and I can see that there is a red led on (See photo - Just above the green LED). No fault codes.

Does anyone know . . .
1) What the Red LED is indicating (for diagnostics - Guessing NOT good.)?
2) Are there other ways to look at fault codes (Installation manual is all I have)?
3) Any remedies for resolution of the issue?

Appreciate all responses. Most of my experience is on SMA and Schneider inverters.

Best regards,

Mike

 

[Phoenix PV]

I figured it out.

Watched the inverter during the initial start up from the panel (cold boot from DC power increase.). Threw code 514 for a few minutes.

514 means com to one of the power stages was not established. The com, I assumed comes through the grey ribbon cable. I turned all power off and removed all fuses and waited 10 minutes for the caps to discharge.

I removed each of the 10(?) pin connectors and re-seated them. Likely a bit of oxidation (not bent or misaligned pins) or the “teeth” on the ribbon cable seated.

Now it has powered up just fine for days without an issue.

Kinda wished the 514 code was latching. Would have made it easier to diagnose.