What Internal Fault means
A drive hardware or software error.
Likely causes
Safe first checks
- Disconnect power for a minute, then restore it.
When to stop
If it stays, call a pool pro.
Checked against: Pentair IntelliFlo3 VSF / IntelliPro3 VSF installation guide (alarms and warnings). Codes can differ by model and year, so confirm with your owner's manual.