Na a lényeg kimaradt: 

1. Ensure timer or switch is in the off position. Turn timer or switch to the on position. Remove fuse F2 (20 Amp),  refer to wiring diagram on page 5 for identification. Reinsert after 5 seconds.

2. Cycle timer or switch off and then back on once more. Remove fuse F2 once again and reinsert after 5 seconds. Heater should attempt to start in 10 seconds after inserting fuse. Coolant temperature must be below the lower threshold before heater will attempt to start.