Blower comes on, pilot lights, burners ignite, big blower comes on but the burners and pilot go out then the blower goes off before the house gets warm,
thermostat is set for 74 goes off at 64 will not come on again until i turn the thermostat off then back on but keeps going off before it reaches the correct temp
The flame detector rod is dirty? try cleaning with sand paper and scraping also. there should be a small amp. reading threw wire coming from flame detector rod. in milli amp range. increases when running. some times i use a jumper to hold gas valve on once started to allow time to test amps.
Its a flame sersor or the system is shutting down due flame sensor sensing a flame rollback because of a plugged heat exchange. Carrier models are bad for it thats why their heat exchangers have lifetime warranties. Is it showing a code ?
Agree with Frank. Flame sensor is likely faulty.
If you are not experienced with gas furnace. Call the gas company. This can be dangerous.
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