HVAC Short Cycling
In the heat mode, unit is short cycling. If I take out the filter or not, it is the same. When I open the service door for the blower, and give it as much air as possible, short cycling stops!
I have made sure nothing has blocked the incoming and outgoing vents, even took off all the vent covers. Not sure if the unit has always done this.
Inside unit thermostadt is set at off=60, on=120, off=160 with a govener set at 160.
Unit shuts off at 160 in about 2-4 min. Room temp has not been met.
It seems there is not enough return air.
What can I do to resolve this??