I have a 22 yr old carrier furnace and ac condenser that has been running fine (as fine as it can in this extreme heat). it quit yesterday afternoon.
outside unit quit
indoor unit quit
there is power to the digital thermostat
there are no breakers tripped
run capacitor is fine
i was told by an hvac tech friend to jumper the red and green t-stat wires in the furnace to see if the blower cuts on.
my question is this----if it comes on, what does that tell me? is it a thermostat wiring issue? is the switch (the one that allows the blower to run when the cover is on the furnace) bad?