Cindy V Pasadena , MD June 19, 2021 Appliance: Frigidaire Room Air Conditioner LRA257ST20 Frigidaire Air Conditioner Lra257st20: Fan speed kept changing and could not change anything on the touch panel. No error code. How to replace Electronic Pc Board. Purchased pc board. It arrived in 2 days. It took longer to take the front panel off the air conditioner than to change out the pc board. Less than 100 bucks instead of buying a new one for 700...I'm good with that. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes