I think my dehumidifier has gone on the fritz. The fan works perfectly and the compressor works good. The problem is the evaporator freezes over without letting any condensed water drip into the catch bucket. Is the compressor suppose to cycle intermittently to let the condensation drip down? What do you think might be the problem and is there economical fix? It's 40 years old and doesn't owe me anything. Recommend a replacement brand/model? Thanx