George W Thornton , TX March 16, 2014 Appliance: Roper Freestanding Electric Range FEP310VQ0 Roper Range Fep310vq0: The oven wouldnt turn on. How to replace Range Surface Element Infinite Switch. I took the back panel off. Checked for voltage to the control dial and there was voltage present. Then checked voltage coming out of the control knob and there wasnt any. Found my problem. Ordered the part and two days later installed it. Works perfectly. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes