Mercedes-Benz 2012 A-Class Owner's Manual page 140

Operating the climate control system
138
Problems with the auxiliary heating/ventilation
Display messages
$
FAIL
©
FAIL
FAIL
Possible causes/consequences and M Solutions
The signal transmission between the transmitter and the vehicle
is faulty.
X
Change your position in relation to the vehicle, moving closer if
necessary.
X
Make another attempt to switch the auxiliary heating on or off
using the remote control.
There is too little fuel in the fuel tank.
X
Refuel at the nearest filling station.
X
Make another attempt to switch on the auxiliary heating using
the remote control.
The auxiliary heating is faulty.
X
Have the auxiliary heating checked at a qualified specialist
workshop.
The auxiliary heating cannot be switched on or has switched itself
off.
The auxiliary heating was started more than twice when the engine
was switched off.
X
Switch on the engine and let it run for more than ten seconds.
X
Make another attempt to switch on the auxiliary heating using
the remote control.
The auxiliary heating cannot be switched on or has switched itself
off.
The starter battery is not sufficiently charged.
X
Charge the starter battery.
X
Make another attempt to switch on the auxiliary heating using
the remote control.