Todd B Sumas , WA July 24, 2016 Appliance: Model LDF7920ST Main pump not working LG Canada does not allow you to purchase parts which forced me to order in the US. I found that LDF7920ST and LDF7932ST are the same for most parts. I replaced the motor assembly and impeller which made a significant difference. All in all not a hard job. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes