I disconnected power source (unplugged it). I then used a continuity tester to test the limits and stats' and fuse. All were closed then I tested the heating element with an ohm meter all good I then traced the wires to the timer, tested for continuity. (turned timer dial to call for heat) between line and the heater wire found no continuity. I then removed and disassembled the timer found the contacts between the line and heater contact were burned and had melted the plastic guide post I cleaned and adjusted contacts. it worked for a short time, I decided it was wise to replace it rather than repeat repair of it. Great supplier. Delivery service less than satisfactory, paid for rush got it 3 days later. RG