Trans Canada Lumber

I have bought the house for multiarea development buider on April Since the first year I had a problem with furnance in my house installed by the builderI called them about the issue and they fixed the thing but it only lasted 2days and it was brokenI called them and told about the issue and they send somebody again the oerson came and change the same part as beforeNow I had the same problem with my furnance so I called the builder and they gave me a number to callI called the person and explained them that the real issue was never fixed due to which the same part is failing again and again the part is air pressure switch in the furnanceThe builder contractor is saying they had nothing to do with this because it is out of warrantyI called the *** air system and explain them a issue and they said the furnance should be register online to cover the cost of the part which is installer problemThe installer is saying he provided the service to the builder not to me an