Make sure you are connected to city water, or water in your fresh water tank and pump on.
Turn on any hot water tap to let the air out so water will come into your tank. Verify all the air is purged by opening the tank pressure relief valve a little.
In your convenience center, make sure the water heater bypass is off. Make sure you do NOT turn on your water heater until all the air is out or you could cause damage.
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