Clifford P Wickenburg , AZ April 13, 2020 Appliance: LG Microwave Hood Combo LMHM2237ST Lg Microwave Lmhm2237st / : Microwave would not heat. How to replace Microwave Door Switch. Replaced the holder assembly with 3 switches assembly. I am a retired GE appliance dealer. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 2+ hours