2 year old thermopride furnace. Is it normal to take 3 minutes or so to warm up before blower comes on? Its warms up the house fine then goes off but blower remains on to blow out rest of warm air. It goes off then a couple minutes later or so the blower will kick on briefly then stop. I know its called short cycling and is it normal. It does it only once. It use to do it 8-10 times then we extended the fan off setting to a lower fig so it would remain on longer( 92). Also tech tightened the pulley to med high so it blows better but it started to short cycle and sides of unit itself seem to suck in very quickly as blower goes on then its fine.