My thermostat turns on, I hear the gas burner ignite, but the blower doesn't come on and I'm getting strong smell of something burning like electric motor or wire something like burnt hair on electric coil. I listened and heard a high pitch sound(like blower trying to start), but no blower. I then shut thermostat off for a couple hours and turned thermostat back on, and everything is working again. I'm afraid something may catch on fire though, especially at night or when I'm not home.