I live in a new townhome with a Ruud furnace that is less than 2 years old. Over the last few weeks the system would start and stop randomly, so I would flip the power switch to get it to reset. Now it does nothing. There is a low hum that comes from the unit but the blower does not turn on and I can not tell if it ignites, or anything. No gas smell. Is there some things I can check and see if I can do before I call an HVAC company to come and check it out. Thanks in advance for your help.