BMS fault codes
16 codes across 5 brands whose manufacturer wording names the battery management system (BMS) or the battery's communication with the inverter.
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
- Warning 500 · Lithium battery communication failedLithium battery communication failed
- Warning 507 · BMS failureBMS failure — charge and discharge blocked
- Warning 509 · BMS message failureBMS battery message failure
- Error 500 · BMS communication faultBMS communication fault
- Error 501 · BMS failureBMS failure — charge and discharge blocked
Work 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.
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.
- BMS
- battery management system
- battery communication
- battery–inverter communication
- charger CAN communication