Emerson Commander SK Variable Frequency Drive- Trip Indications August 31, 2021 20:48 Updated Related articles Emerson Commander SK Variable Frequency Drive- Hardware Fault Codes (HF) Troubleshooting Error Code Flowcharts for STC controller SlideDriver Programming & Operations Manual (all models) (ERR3) error 3: hy5a comm error Replacement VFD has different color, model number, and branding