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Technical Support / Re: No A/C Thermostats
« Last post by Fred Brooks on December 31, 2025, 04:02:10 PM » Bobby,
As I recall to the best of my knowledge, the front T-stat is the source of power that feeds the other t-stat. The 5 button t-stat is obsolete. If you replace it with the newer 10 button comfort control the issue that you will run into is if the front air conditioner is the original Dometic model, the PC board will not respond to the t-stat. Remove the 5-button t-stat cover and check the 2amp fuse first. If that is good, check the 5amp fuse mounted on the PC board located inside the front air conditioner by removing the A/C shroud and accessing the PC controls. While you are up there get the model number of the air conditioner. Please advise. Fred
As I recall to the best of my knowledge, the front T-stat is the source of power that feeds the other t-stat. The 5 button t-stat is obsolete. If you replace it with the newer 10 button comfort control the issue that you will run into is if the front air conditioner is the original Dometic model, the PC board will not respond to the t-stat. Remove the 5-button t-stat cover and check the 2amp fuse first. If that is good, check the 5amp fuse mounted on the PC board located inside the front air conditioner by removing the A/C shroud and accessing the PC controls. While you are up there get the model number of the air conditioner. Please advise. Fred

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