I have a carrier heating & air conditioning unit . This is the first time we have tried to use it this fall. When the unit tries to light it blows out the pilot and doesn't light. Usually with a big woof.. sometime its lights but usually doesn't.:rolleyes: please help

I have a carrier heating & air conditioning unit . this is the first time we have tried to use it this fall. when the unit tries to light it blows out the pilot and dosn't light. usually with a big woof.. sometime its lights but usually doesn't.:rolleyes: please help
Make shure the burners, cross-over tubes, and heat exchanger are clean. May as well clean and adjust the pilot. Also install a new thermocouple while you are at it.