Burning smell

Hi everyone I'm new to the group and also new to Mazda.

I have had a Mazda 2 tamura 1.3 2009 for about 2 weeks now had no probs with it so far but the past couple of days been getting a paper like burning smell in the car but only when I've got the heater on.

I've checked coolent and oil and everything seems fine bo smell of burning paper in the engine bay.