Hi,
I hope someone has an answer to this.

The blower of the furnace turns off while the burners keep burning.
After about 30 seconds, the burners shut off (I presume because of high
temp limit, since there is no air blowing), then about 10 seconds after
the burners shut off the blower turns ON again, then the burners kick
in again and the blower runs for about 2-3 minutes but then it shuts
off again while the burners burn, and so on repeteadly. All this while
the therm. is calling for heat. It is as if the blower cannot run
constantly while the burners are burning. Fan is set to Auto on the
therm.

Some more info. When the unit is first turned ON the fan appears to be
able to run for a longer time while the burners are burning, but
eventually shuts off before the burners go out. As the system runs
cycling like this, the blower cycles get shorter, that is the blower
cannot stay on for more than 2-3 minutes while the burners are burning.

I realize this is very dangerous as the burners and the core will get
very hot since there is no air flowing. The exhaust fan is running all
the time while all this cycling is happening. I have called a heating
specialist to come see the system but I want to make sure I am well
educated so that he does not give me the run around.... Also, what
should I expect to be charged in the north east for furnace maintanance
service if no new parts are needed ?

The system is a York 80 Diamond, natural gas, FHA.
The york 80 comes with an electronic furnace controller White-Rodgers
model 50A50-210 (I believe the 50A55 replaces the 50A50), so there is
no hi/lo limit controls that I can adjust... I don't know the age of
the furnace but the house is 20yrs old.
Any help and advice is greatly appreciated.

Thanks!!!!
Tony