firedude

My 15 y.o. Lazboy Limited runs but the blower is constant on, creating noise and steam constantly. It's a old spa but I figure the malfunction is likely caused by the topside controlle which, by now, the LCD is gone and the buttons don't do much. My Gecko controller is labelled K600-DG with options GF-KDG-SP-NO and, as far as I can, the current models need "reprogramming" to function with the older spa. Is there a direct replacement for this controller? And does the blower constantly running sound like its a problem with the control panel? Thanks for any time you take to help me! Ed (Firedude)