We had the 2.1 with our 2012 Norcold, but found out last year that because we had our cooling unit replaced in 2015, twice, the new circuitry in the Norcold unit was not compatible with the 2.1 and we had to upgrade to I believe was the 3.1 ARP.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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