Originally Posted by
Dan Druff
Situation:
I have a two-thermostat system (one for upstairs, one for downstairs).
Starting today, the fan is incredibly loud for downstairs only. I verified it's the fan by turning it on by itself. At first I thought there was something wrong with the furnace, but apparently not.
What would cause the fan portion of the system to abruptly get loud? It sounds like a deep, loud humming sound, whereas before it just sounded like blowing air.
Anyone knowledgeable in this field have any idea what's going on? If I don't get answers here, I'll have to call a Russian down here on Monday and open the Jew wallet.