Ken -does your Ranco switch stay open-circuit all the time as you move the temperature control lever? It should be open-circuit while in "heating" mode, and as you slide the lever past the "mode change" position you hear a click, followed by a further click as you continue to move the lever to the left. The second click is when the Ranco switch should go closed-circuit. Also worth checking the terminals in the crappy "double bullet" connector - I'm going to replace this on mine with something a little better. The copper capillary tube is very fragile at the point where it enters the switch - don't bend it too much! DAMHIKIJKOK!!