9-15-25 Carrier unit #7 no fire Horizontal 90% furnace #7 series # 3008A04658 Furnace would not fire during the fall heating check out. Tested the system today found the inducer motor pressure switch is not closing located the problem being a wasp nest in the exhaust outside. It was actually two nests. I use the inducer motor to blow the wasps nests out. This repair did take some time, however the access to the air handler itself and access to the exhaust pipes out of the way. Reattached all the tubing and wires to the pressure switch and cycled the furnace about four times checking for proper operation is working at this time in the heat mode I didn’t try tolocate one more unit to test for heating function. I didn’t do the tuneup so I don’t know which unit they missed.