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Attic air handler control board had failed. No LEDS. Made sure transformer is providing 24V to board, that fuse in good and that there are no open switches. Several spots of obvious corrosion on control board. System is down and has been down. Undercharged on refrigerant as diagnosed last year. Please consider system replacement quotes provided by DiBiase. Shut air handler breaker OFF Completed tune up for basement (1st floor system) Mr. Fisher replaced failed ignitor and gas valve over this winter. Completed maintenance for 80,000 BTU furnace in basement: Replaced 16x25x1 filter. Was very dirty. Recommend replacing ever 2 months. Dirty filter could very likely e the cause of the failed ignitor Used soap bubbles on all gas piping joins after gas shut off valve to ensure there are no leaks. Gas pressure if new valve needed slight adjustment. Cleaned flame sensor with 0000 steel wool; verified flame rectification circuit. Measured ignitor ohms (71 ohms) Good.271N Combustible and dr