Water pouring out of TPR pipe

Water pouring out of TPR pipe

Last night my son said there wasn't any hot water. My husband turned up the thermostat on A.O.Smith gas water heater Part no. 183496-000. This morning there was water pouring out of the TPR pipe. We do have an expansion tank.

When I shut off the hot water outlet pipe from the tank, the water stops pouring from the TPR pipe.

Is it just a matter of waiting til the temp comes down in the water? Or is something broken?

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