I have a Carrier model 58RAV075-JC furnace. It's the dead of summer here and ambient temperature is running about 100 degrees F every day. I noticed the inducer fan running, actually cycling on and off, while the air handler blower is off. Obviously, I'm running in the cooling mode now, so this is a mystery. The LED is flashing 22 - Abnormal Flame Proving Signal. I don't know what to do to clear this or what's causing it. Evidently, it is affecting the blower control, because it will get into a cycle where the blower won't run, and the evaporator will freeze up. If I remove the blower door, the saftey switch will shut down the inducer fan. If I close the switch, the air handler blower will come on and run indefinitely with the thermostat switch selected to "On," and the inducer blower will continue to run. The condensing unit outside will operate properly in this confguration. Even after disconnecting main power supply to the furnace, the error will not reset.

About 10 years ago, the circuit board had to be replaced because the blower relay failed.

Any help would be greatly appreciated.

did the circuit board get wet recently or have any electrical storms???? sounds to me like maybe you have a 24 volt issue somewhere.

We've been in a severe drought, with no lightning prior to this problem showing itself. I checked for moisture, but none is present. There is a slight amount of particulate dust and debris on the board that I have'nt blown off.

Thanks for the quick response.

I tried to get the thing to a "steady state" this morning so I could run the self test, but could not get it to work.

try shutting it down for maybe 1/2 hour and see if it will reset. otherwise if it will run with th stat on on than maybe just run it that way. it wont hurt the system and wont cost a whole lot to run it 24/7.
the inducer shoudl not be turning on.. might be time to get a tech out to trace the low and high voltage wiring to find issue.

Thanks....right now, I have it on "Auto" with the inducer uplugged. I'll go home and check it in a bit and see if it's cycling with the condensing unit. My tech isn't a Carrier guy, but maybe we can work through it.

a good tech can work on anything.. they all work the same. good luck and keep us posted.