Check voltage feeding EMS control board. If it does not see 120/240 vac it defaults to 30 amp power monitoring. This may mean checking the neutral connection as well. Let us know what you find. Also give us the model of transfer switch and EMS. Thanks
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Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7
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