Timi R Livingston , TX July 01, 2019 Appliance: Electrolux Freezer, Upright FFVU17F4QWB Electrolux Freezer Ffvu17f4qwb: Thermostat went out. How to replace Freezer Temperature Control Thermostat. Had company diagnose the problem, ordered the part from APP, replaced ourselves. As we did not see the repairman remove the old part, we had to use a voltage meter to figure out where to replace wire nodes. That was the only hiccup, if we had seen exactly where they were before, the job would have been even easier. Main labor was removing back facing to get to the part and then replacing that back facing. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes