A8A3 : No Red Inline Current

To avoid serious injury follow all warnings and instructions in the manual. Wear appropriate personal protective equipment.

Visually check circuit breaker for a tripped condition. 

Measure voltage across input terminals on power line filter. Voltage should measure between 190 and 264 VAC. 

Check for loose or disconnected wires or plugs. 

Measure resistance of heater(s).