1.1 Burner motor

1.11 Fuel solenoid valve

2.6 Diode

1.2 Ignition electrodes

1.12 Flame sensor

2.7 Main fuse 25 amp

1.3 Ignition spark generator

1.13 Temperature sensor

2.7.3 Water pump fuse 10 amp

1.5 Overheat switch (stage 1)

1.14 Fuel nozzle pre heat

2.12 Water pump

1.5.1 Overheat fuse (stage 2)

2.1 Control unit

3.2.2 HVAC control

1.8.5 Varistor

2.5.10 Relay, burner display

3.4.8 Diagnostic light

5.1 Battery