As soon as the heater receives its starting pulse, the following processes are triggered by the central control unit:

• Automatic safety check.
• The glow plug is warmed up.
• The metering pump conveys fuel.
• The burner motor starts smoothly.
• The fan delivers combustion air.
• Fuel-air mixture ignites (flame formation).
• The hot combustion gases flow through the heat exchanger that delivers the heat to the coolant system of the vehicle’s engine.
• The heater is controlled electronically and works – according to heat requirement – in several power stages.