Press the . The display will show the flame symbol and the remaining heating time (default is usually 30 minutes).

If the heater fails to ignite, you may need to clear a "lockout." A common method is to remove the 20A heater fuse for 30 seconds while the unit is trying to start, then replace it.

The Webasto (often the 1533 "Oval" model) is a compact control unit used to program and operate your vehicle's parking heater. It allows for immediate heating or scheduled starts to ensure your car is warm before you enter. Core Operation Guide Immediate Heating (Instant On):

Press the repeatedly to choose the desired program number (1, 2, or 3).

Wait for the display to stop flashing; the program is now active (the corresponding number will stay visible on the screen).

If the display shows "F" followed by two digits (e.g., F01), this is a fault code. Refer to the Webasto 1533 Manual to identify the specific issue. Webasto Oval Timer 1533 Operating Instructions Manual