Thanks for the reply, but we have figured out that it was the fan relay switch. We ordered one from you (great service! ) and it is working fine now.

Thanks again,
Annessa

Our Goodman furnace ( model # A48- 20) is turning itself off and on when it comes on. It will kick on, run for a few seconds, turn off quickly, then kick back on again. It will run fine after that. He ordered a sequencer and 4 limit switches from here & received and installed them today. A frien...