my unit freezes up in heating mode. i have a amana model asz160361 it is 5 months old , i had the same problem with the old one same model when it was 6 years old, it seized up and it was on warranty so it was replaced with this new one but failed in december. my technicien said that the pipe to the house should have been 1 1/8 not 7/8 inch to remedy the problem. he has quoted me 2,000$ to change the pipe. will this correct the problem?