Since you haven't stated year,make,model of your TT NOR the brand of A/C unit I will guess at your issue...
The gateway isn't what is causing the issue for that Zone ( rear A/C ) to not turn the furnace on..
Instead you need to look at the CONTROL BOARD for that A/C unit.. there is a relay that controls the two blue wires ( Signal Wires ) to complete the circuit so that the furnace mounted control board knows to turn the furnace on
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2007 GMC Classic club cab 4x4 Duramax LBZ
2014 Alpine 3010 RE. 34 foot fifth wheel
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