Hi,

That sounds like a bad photocell or a dirty photocell....check the photocell and clean it firt and then replace if neccesary...

Here are a couple of tips that I wrote that tell you how to troubleshoot a Torpedo or Reddy heater...

Reddy Heater - Troubleshooting Torpedo Heaters

Torpedo Heater Pump Pressure Adjustment

heatman101