Remove hot pipe connection, and flush out through drain valve.
Or remove TP valve and flush out through drain valve.
Connect small circulating pump to 5 gallon bucket with 2 gallons white vinegar like they do with tankless water heater, as shown following Bosch manual. And let run for 45 minutes.
http://waterheatertimer.org/pdf/Bosch_Descaling-heat-exchanger.pdf
White vinegar is safe for humans.
If odor is the problem, use H2O2 hydrogen peroxide, and not bleach. Hydrogen peroxide is safe for humans and easy to flush out of water heater and pipes. While it can take weeks to get rid of bleach, which is caustic and toxic.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
SOURCE: atwood water heater problems
probly the sensor on the modul. Take and clean it off with emery cloth and then reinstall it.
SOURCE: I have an atwood water heater that won't stay light
my water heater locks out now and then. I just changed the theromostat and ECO valve. Seemed to help but still occurs occasionaly.
John
SOURCE: Atwood water heater - pilot light and flame malfunction
Michael,
The thermocouple sensor may not be in the best position to sense that the pilot is lit.
Adjust the thermocouple mount or simply bend the thermocouple "wire" so that the pilot flame is touching the tip.
SOURCE: I have Atwood GC6aa-9e. Water isn't getting hot.
If you've checked at pressure relief valve ( careful, not to burn yourself just in case it is hot) by pulling lever and catching some water that comes out in a cup or whatever. If it feels hot out of there, check that by-pass isn't faulty. Not uncommon for valves to seize, and only partially open, or close, and end up mixing hot with cold.
Testimonial: "This was the solution.We did the pressure relieve valve suggestion, also one of the valves was stuck in the wrong position mixing hot with cold.Thanks"
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