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We to had this happen to one tank and our system shifted over to the other tank. According to my husband it is because they may not have mixed any methyl alcohol into the propane to keep it from freezing. Let me see if I can remember what he told me...As the gas leaves the tank it is drawing energy into the tank. So if the area around the tank is cold the tank will become cold and eventually freeze. Have some new propane added and it will most likely have the methyl alcohol in it and should prevent it from freezing. We have not had the issue again since we added some new propane to that tank and we have used our in -15 degree weather.
I have to admit I was very angry when this happens to us because what if we were relying on that tank to keep us warm and didn't have another one?! I think all propane should be required to have the methyl alcohol in it. Mama wants her heat! :-)
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