We camped over Thanksgiving weekend and with temps dipping into the 40's, we ran the heat pump each night. On Friday night, I woke up around 2:00 am and the system was blowing ice cold air as if the ac was on. I turned it off for the night and ran the furnace to warm things up. The following morning I saw a lot of water had ran off the roof and decided that the heat pump had frozen up and then thawed out after I turned it off. The following day and night we ran the heat pump again and all has worked flawlessly. Any idea what happened on Friday?
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