Problem solved! I tore the panel off to get to the lines behind the convenience center. I bypassed the hot water heater and everything worked fine. Definately ice in the line that caused an airlock. Thanks for the hint about the trouble light behind the convenience center. I had a 100W bulb burning in the basement, but will move it behind the convenience center. Thanks for the help. Not much you can do when temps get that low except move south!
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