You mentioned above you do not have a freshwater hose connected. To purge the air from your water heater you will have to run your pump. To run your pump you need to have water in your freshwater tank.
Do not turn on your hot water heater or you could damage it unless all the air is purged.
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Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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