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Frozen gas line inside a RUDD heater.

RW824 Member Posts: 2
I have a RUDD MUA Model # CFA-M 236 with a variety of gas line sizes ranging from 2” to 2 1/2”. There is ice all through the inside of of the 2” + gas piping going through the control cabinet. Any thoughts on how the ice / moisture got inside the lines? This is a natural gas system. Thank you