SolarEdge
AC Voltage Too High
AC Voltage Too High (31/33, 2x1F/2x21, 3P 64-66)
Grid voltage above the configured country grid code limit, inverter disconnects to comply.
Common causes
Voltage rise in the AC runHigh supply voltageWrong country code set
What to check
STEP 1
Verify the country grid code is correct (UK G98/G99).
STEP 2
Measure grid voltage at the inverter terminals at peak export. Long runs may need larger AC cable.
Escalate if
Settings and wiring verified but trips continue
Need full interactive diagnosis?
Faultpath walks you through decision trees, fault codes, and commissioning — built for solar & battery engineers.
Open Faultpath
More SolarEdge fault codes