Answer
Oct 26, 2025 - 08:35 AM
The Coleman-Mach 9420-391 Wi-Fi thermostat is built for Coleman-Mach single-zone systems that use Coleman control boxes/harnesses. Your Dometic setup uses a Dometic CT single-zone control box (3316250.712) with a 3-wire harness. The signaling, pinout, and control logic are different, so the 9420-391 will not plug in or work with your Dometic control box.
If you want phone-app control on that Dometic system, stick with the Micro-Air EasyTouch RV 351 series (ASY-351-WH/BK)—that’s the direct-fit, 3-wire, 12V option for Dometic CT single-zone. You can find the black version here --> https://www.rvupgradestore.com/Micro-... & the white version here --> https://www.rvupgradestore.com/Micro-...
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