In order to troubleshoot your Atwood G6A-7 Water Heater you will need to take the unit into a dealer for service. From there, a trained RV technician can properly diagnose and remedy the issue. If it needs replaced, the best replacement option we offer is tankless, the Furrion RV Tankless Water Heater part # FR68SR. It won't be a direct replacement but still pretty easy nonetheless as they are very similar. That said, you won't have to worry about enlarging the cutout or anything like that,... view full answer...