How do I fix PV Connector Polarity Fault on a FoxESS?

Power down DC isolator. Measure polarity of each string with a multimeter at the inverter DC input terminals before connecting Then: Correct any reversed connections. Do not connect until polarity is confirmed

FoxESS

PvCon Dir Fault

PV Connector Polarity Fault

PV connector polarity is reversed on one or more strings.

Common causes

MC4 connectors wired with reversed polarityLabelling error during cable installation

What to check

STEP 1

Power down DC isolator. Measure polarity of each string with a multimeter at the inverter DC input terminals before connecting

STEP 2

Correct any reversed connections. Do not connect until polarity is confirmed

Escalate if

Polarity confirmed correct and fault persists — escalate

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More FoxESS fault codes

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Error 26

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Error 27

Grid Frequency Out of Range

Error 28

10-Minute Average Voltage Fault

Over Load

Inverter Overload