Problems with the remote control for the stationary heater/ventilation
FAIL 
appears on the remote control display
appears on the remote control display Possible cause:
The signal transmission between the transmitter and the receiver is malfunctioning.
Change your position in relation to the vehicle, moving closer if necessary.
FAIL appears on the remote control display
Possible cause:
The starter battery is not sufficiently charged.
Charge the starter battery.
Possible cause:
The outside temperature is higher than 15 °C.
Use the stationary heater only if the outside temperature is below 15 °C.
Possible cause:
The fuel tank is not sufficiently filled.
Refuel at the nearest filling station.
FAIL 
appears on the remote control display
appears on the remote control display Possible cause:
There is a malfunction in the stationary heater.
Have the stationary heater checked at a qualified specialist workshop.