Meter, CT and comms fault codes
23 codes across 9 brands whose manufacturer wording names an energy meter, a current transformer (CT) or an external communication link.
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 304 · CT open or wrongCT open or wrong
- Warning 305 · CT reversed or ground failCT line reversed or ground fail
- Warning 306 · SP-CT data not receivedSP-CT communication fault
- Warning 307 · Communication faultCommunication fault
- Warning 401 · Meter abnormalMeter abnormal
- Warning 402 · Optimiser communication abnormalOptimiser communication abnormal
- Warning 403 · String communication abnormalString communication abnormal
- Error 306 · CT L-N reversedCT L and N reversed
- Error 307 · SP-CT data not receivedSP-CT communication fault
- Error 308 · Pairing timeoutPairing time too long
- Error 411 · Communication faultCommunication fault
SolarEdge
1 of 361 codes · open libraryEnphase
2 of 13 codes · open librarySigenergy
1 of 13 codes · open libraryHoymiles
1 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.
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.
- meter
- power meter
- smart meter
- energy meter
- CT
- CT clamp
- communication
- communication fault
- communication error
- communication lost
- communication abnormal
- not reporting
- failed to report
- offline