See if you can find a new "matching unit"; otherwise the new control boards being use are not compatible with the other unit's and both the thermostat and the remaining control board will have to be replaced so the whole system can be operated with one thermostat.
Duo-Therm is Dometic.
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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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