Thermostat Upgrade Fitment for a Coleman Mach 9203C876 Polar Mach AC Unit
Updated 10/30/2025 | Published 09/29/2025
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Question:
2008 Jayco Seneca 35GS HD with 2 Coleman Mach 9203C876 Polar Mach AC 13.5K BTU each with two of the thermostats in the attached picture. I want to replace the thermostats with The Coleman Machine 9420A382 Digital Thermostat. Is this thermostat compatible with my setup? Thanks in advance!
asked by: Debbe B
(click to enlarge)
(click to enlarge)
Expert Reply:
Hey Debbe, thanks for reaching out!
Yes, the Single Zone Digital Thermostat # CM76RR will work as a replacement for your current thermostats. This has a smaller profile, so I also recommend picking up the Oversized Mounting Plate # CM22RR for each thermostat to help hide anything on the wall behind your current thermostats, like holes.
Did your old thermostats go out, or are you just looking for something newer?
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Single Zone Digital Thermostat for Coleman-Mach RV Air Conditioners - Black
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Jon G.
10/30/2025
Hey Debbe, how did the swap to the Single Zone Digital Thermostat go on your Jayco Seneca? Did the oversized mounting plate give you the clean look you wanted on the wall? Your feedback could really help others planning the same upgrade.