Rael M Lakeland , FL January 18, 2019 Appliance: Frigidaire Room Air Conditioner LRA18HMU218 Frigidaire Room Air Conditioner Lra18hmu218: Frigidaire ac compressor wouldn’t shut off!. How to replace Electronic Pc Board. I goggled the issue, seems to be a common problem with these units, I ordered both the main circuit board and the circuit board controlling the switches. I replaced the main circuit board in about an hour, hard to get at, take lots of pictures where they wires plug into, I plugged it in and it’s working! Saved me 600 bucks from buying a new one! I’ll return the unopened part or keep it just in case, the person I spoke with was very helpful, I almost ordered the wrong part, but she got me squared away. Very very fast and prompt service, will definitely recommend this web page for further repairs for appliances. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours