Grid voltage fault codes
128 codes across 15 brands whose manufacturer wording names grid or AC-side voltage outside the inverter's configured operating range.
A family groups codes by the manufacturer's wording. It does not mean the codes share a cause, a trip setting or a fix: the same words can describe different measurements on different hardware, so work each code from its own entry and its manufacturer's document.
Codes by brand
Fronius
2 of 29 codes · open librarySolarEdge
83 of 361 codes · open library- 2xEAC voltage surge
- 2x1DLine to Neutral voltage is above threshold
- 2x1ELine to Neutral voltage is below threshold
- 2x1FGrid voltage is above the country limit
- 2x20Grid voltage is below the country limit
- 2x21Grid voltage is above the country limit
- 2x29Grid voltage is below the country limit
- 18x19AC voltage surge
- 18x1AAC voltage surge
- 18x1BAC voltage surge
- 18x1CLine voltage is low
- 18x1DLine voltage is low
- 18x1ELine voltage is low
- 18x1FGrid voltage is above the country limit
- 18x20Grid voltage is above the country limit
- 18x21Grid voltage is above the country limit
- 18x22Line voltage is low
- 18x23Line voltage is low
- 18x24Line voltage is low
- 18x25Grid voltage is above the country limit
- 18x26Grid voltage is above the country limit
- 18x27Grid voltage is above the country limit
- 18x28Line voltage is low
- 18x29Line voltage is low
- 18x2ALine voltage is low
- 18x2BGrid voltage is above the country limit
- 18x2CGrid voltage is above the country limit
- 18x2DGrid voltage is above the country limit
- 18x2ELine voltage is low
- 18x2FLine voltage is low
- 18x30Line voltage is low
- 18x31Line voltage is high
- 18x32Line voltage is high
- 18x33Line voltage is high
- 18x34Line voltage is low
- 18x35Line voltage is low
- 18x36Line voltage is low
- 18x37Line voltage is high
- 18x38Line voltage is low
- 18x6FGrid voltage is above the country limit
- 18x70Grid voltage is above the country limit
- 18x71Grid voltage is above the country limit
- 18xD8Grid voltage is above the country limit
- 18xD9Grid voltage is above the country limit
- 18xDAGrid voltage is above the country limit
- 18xDBGrid voltage is below the country limit
- 18xDCGrid voltage is below the country limit
- 18xDDGrid voltage is below the country limit
- 18xE4The line to neutral voltage on the AC side of the system is out of range, based on the trip…
- 18xE5The line to neutral voltage on the AC side of the system is out of range, based on the trip…
- 8x19 · CommercialAC voltage surge
- 8x1A · CommercialAC voltage surge
- 8x1B · CommercialAC voltage surge
- 8x1C · CommercialGrid Voltage is below the country limit
- 8x1D · CommercialGrid Voltage is below the country limit
- 8x1E · CommercialGrid Voltage is below the country limit
- 8x1F · CommercialGrid voltage is above the country limit
- 8x20 · CommercialGrid voltage is above the country limit
- 8x21 · CommercialGrid voltage is above the country limit
- 8x22 · CommercialGrid Voltage is below the country limit
- 8x23 · CommercialGrid Voltage is below the country limit
- 8x24 · CommercialGrid Voltage is below the country limit
- 8x25 · CommercialGrid voltage above country limit
- 8x26 · CommercialGrid voltage below country limit
- 8x36 · CommercialAC grid voltage malfunction
- 8x38 · CommercialAC grid voltage malfunction
- 8x42 · CommercialGrid Voltage Spike
- 8x43 · CommercialGrid Voltage Spike
- 8x44 · CommercialGrid Voltage Spike
- 33x19 · TerraMaxAC voltage surge
- 33x1A · TerraMaxAC voltage surge
- 33x1B · TerraMaxAC voltage surge
- 33x1C · TerraMaxLine voltage is low
- 33x1D · TerraMaxLine voltage is low
- 8x1E · TerraMaxLine voltage is low
- 33x1F · TerraMaxAC voltage surge
- 33x20 · TerraMaxAC voltage surge
- 33x21 · TerraMaxAC voltage surge
- 8x22 · TerraMaxLine voltage is low
- 33x23 · TerraMaxLine voltage is low
- 33x24 · TerraMaxLine voltage is low
- 33x25 · TerraMaxAC voltage surge
- 33x26 · TerraMaxLine voltage is low
Enphase
1 of 13 codes · open librarySigenergy
2 of 13 codes · open libraryHoymiles
6 of 31 codes · open libraryWork it on site
Symptom-led sequences and checks that record the evidence for this kind of alarm. Follow the code's own entry for its documented step.
Guided decision trees
Members with a reviewed, step-by-step walk of the manufacturer's own procedure. Each opens on the code's entry.
Terms
Standards scope
Scope pages: what each standard covers and where it sits against the others. They do not reproduce the standard, and nothing on this page states what it requires. Work from the current published edition.
How codes are placed here
A code joins only when the manufacturer's own title or description contains one of these terms as whole words. The title decides first; Wattbench's fixes and search keywords are never read. A code that matches no family, or more than one, stays unclassified.
- grid voltage
- grid over-voltage
- grid under-voltage
- over grid voltage
- under grid voltage
- AC voltage
- AC over-voltage
- AC grid voltage
- grid (mains) voltage
- line voltage
- line to neutral voltage
- phase voltage
- grid phase voltage
- grid line voltage
- 10-minute average voltage
- 10-minute grid over-voltage
- 10min volt
- 10 min value grid overvoltage