Isolation fault codes
25 codes across 13 brands whose manufacturer wording names low insulation resistance or an isolation fault between the PV array and earth.
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
8 of 361 codes · open library- 2xAGround faults may occur due to insufficient insulation to the ground
- 2x19PV solar array is not properly isolated from ground earth
- 2x25Ground faults may occur due to insufficient insulation to the ground
- 2x26Ground faults may occur due to insufficient insulation to the ground
- 8x2B · CommercialGround faults may occur due to insufficient insulation to the ground
- 8x2C · CommercialGround faults may occur due to insufficient insulation to the ground
- 8x39 · CommercialGround faults may occur due to insufficient insulation to the ground
- 8x58 · CommercialPV solar array is not properly isolated from ground earth
Enphase
1 of 13 codes · open librarySigenergy
1 of 13 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.
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.
- insulation resistance
- insulation impedance
- insulation fault
- insulation failure
- insulation error
- insulation protection
- insulation to the ground
- insulation between the array and ground
- isolation fault
- isolation failure
- isolation fail
- isolation impedance
- isolation low
- iso fault
- iso resistance
- not properly isolated from ground
- isolation