solar troubleshooting
Rapid shutdown fault will not clear
Common symptoms: rapid shutdown fault; rts fault; shutdown error solar; module level shutdown error
Stop and call a pro if:
- PV conductors can remain energized in daylight; do not open enclosures
- Do not bypass rapid shutdown hardware or jump conductors
Step-by-step diagnostic flow
Step 1
Do you see heat damage, smoke, or active arcing near inverter, combiner, or rooftop equipment?
Step 2
Did the rapid shutdown initiator (service disconnect/E-stop) return to the normal RUN position after service or inspection?
Step 3
Did this begin after roof work, module replacement, or cable disturbance?
Possible outcomes
Stop — possible electrical hazard
high confidenceVisible thermal damage or arcing on PV equipment is a life-safety issue.
- Trigger shutdown only if safely accessible
- Keep clear and call installer or fire department
Rapid shutdown initiator position caused the fault
high confidenceLeaving the initiator in shutdown/test keeps module-level electronics offline.
- Return initiator to run mode
- Confirm fault clears and production returns
Likely rooftop communication/string issue after recent work
medium confidenceRapid shutdown faults commonly follow disturbed rooftop wiring or connectors.
- Do not open rooftop connectors yourself
- Schedule installer diagnostics with fault code logs
Persistent rapid shutdown fault needs installer diagnostics
medium confidencePersistent RTS faults with normal controls indicate hardware or communication path failure.
- Capture fault code and timestamps
- Contact installer/manufacturer support
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