I have a beckett oil fired furnace, that has an intermittent problem . If I turn it on most of the time it will come on an work perfect however if I set the thermostat to say 70 the furnace will recycle on and of as it should and then it may pop the reset if I reset it now it may start up and work perfect with no problems or it may make a humming sound and not start .I have found that at times I have used a hair fan around the control where the reset is and it will start sometimes I have used freeze spray and it will start I have even given the end of the burner a tap or 2 and it will start . I have resolder all connection on control board no success. This has been intermittent for several years could it be a bad spot on the burner motor?

Replace the relay and check the photo cell at the burner.

Replace the relay and check the photo cell at the burner.
Would it be possible to obtain a wiring diagram of the relay system

You can Google your model for the wiring diagram.

I would check for voltage at the motor when it should be running to see if it is a motor or control issue. The humming tells me you may have a bad motor. They are relatively cheap.

My oil furnace ran out of oil. I now have oil. I replaced the nozzle and filter and bled the lines. I noticed the electrodes are deeply etched where the springs contact them and the arc across the springs is small (about 1/2) inch. The furnace fires for about 1 minute then cuts out, then nothing but stoot. The cad cell is clean. And (oh yeah) I might have mixed up the wiring when putting it back together. What things could be wrong? The system is just a few year old.

I have a beckett oil furnace "AFG" I have had it surviced 4 times in the last two weeks. It had ignition hard starts, pump ran 10 or more seconds before it would lite. They finally decided it was a week transformer and replaced it. Now it lights very hard, quick ignition, but is loud. Can I turn down the air or adjust it so it doesn't rumble the house when it starts. It quiets down after 30 sec. or so. I guess I can live with it now but I would like to make a little milder when it starts.

I have a beckett oil furnace "AFG" I have had it surviced 4 times in the last two weeks. it had ignition hard starts, pump ran 10 or more seconds before it would lite. they finally decided it was a week transformer and replaced it. now it lights very hard, quick ignition, but is loud. can i turn down the air or adjust it so it doesnt rumble the house when it starts. it quiets down after 30 sec. or so. I guess i can live with it now but i would like to make alittle milder when it starts.

Did you get this resolved yet? I have had similar problems with the rumbling. One time it was the drive coupling. It was slipping a little and when it slipped the pressure would drop or pulse. It was probably the best $3.00 part I ever bought. Along with that was the alignment of the pump/coupling. With the unit running you can loosen the two bolts just a little and move the pump just a little and it will correct any wobble which can also have somewhat a pulse effect on the pump and spray. You can feel and hear when it clears.