Causes of blocking of the parking/auxiliary heater include:
Disconnection in the event of undervoltage.
The overheating protection has triggered.
Lack of fuel.
The blocking occurs when a fault is registered during operation, and the parking/auxiliary heater is disconnected. In order to reset the block, the parking/auxiliary heater must be disconnected using the remote control. After three unsuccessful attempts without correct firing, the overheating/heater block is activated.
In this case, the "Unblocking the parking heater" function must be initiated and then the fuse for the parking/auxiliary heater must be removed.
Information for trouble-free operation of the parking/auxiliary heater:
Avoid undervoltage, check the battery and alternator. Problems may arise if the vehicle is only driven for short distances. In the case of undervoltage, the control unit for the integrated heating/air conditioning automatics may not send the start command to the parking/auxiliary heater, which is why it does not start. For this reason, always check the error memory in both the control unit for the parking/auxiliary heater and the control unit for the integrated heating/air conditioning automatics if there is a problem.
There must be sufficient fuel in the tank. The low fuel level indicator lamp for should not be lit on the instrument panel.
Smoke emission; the parking/auxiliary heater is an evaporation burner, and this means that over short driving distances the burner will be greased several times, causing it to emit smoke.
Test conditions:
Ignition on, engine off.
Procedure:
Start the function.
Follow the instructions in the program.
The function is complete.