Mercedes-Benz Forum banner

1 - 1 of 1 Posts

·
Registered
Joined
·
1,906 Posts
Discussion Starter #1
Your 'EC' light must be off for the A/C to work. If the light will not shut off when you press the 'EC' button, this usually means one of three things: (1) You're low on refrigerant; (2) You have a defective refrigerant pressure sensor (usually caused by excess moisture in the system); or (3) You have a defective refrigerant temperature sensor.
You have an error code for low refrigerant (Error code B1241).
You should have the defective sensors replaced. But in the interrim, follow these instructions to override the sensor. (Your A/C compressor has its own pressure switch, so overriding the 'EC' light will not compromise this safeguard.) Switch the ignition on (position 2). Set the left temperature to 'HI' and the right temperature to 'LO'. Switch the ignition off. While holding the 'REST' button, switch the ignition on (position 2). On the left side, 'P1' will flash and on the right side, a code will be displayed. Press the 'EC' button twice so that the left side flashes 'P2'. Using the right side red temperature increase button, add 16 to the value. Press the 'EC button again to store the updated code. Turn the ignition off.
 
1 - 1 of 1 Posts
Top