I recently had a roommate try and replace our old mercury heat pump t-stat with a new programmable wifi digital. When he tested it the fan wouldn't work. A help line said to connect g, c and y to test it. This burned out our board. We replaced the board and still nothing. He went out and got a new motor and run cap. We installed them but still no fan operation. We put the old t-stat back on and manged to get the relay to click but the fan still won't start. We have 24v between c and g. Also there is 120vac going to the fan. The old fan had a high, med and low connection. The new one only has high and low. I wired it in as best I could, minus the med wire. Is there anything else I should try?

When was the last time that you experienced this problem? Did you already consult anyone else like technicians? They might help you especially if the blower motor (http://www.racepages.com/parts/blower_motor.html) is involve.