BMW X5 E53 Webasto Start and Lockout Faults
X5 E53 Webasto won't start, what should I check?
First read the Webasto fault codes with a diagnostic tool and check the fuse, which is in the glovebox. Next look at the circulation pump, the blower and the fuel supply. The air holes of the combustion chamber and cone can also get clogged with carbon, in which case disassembly and cleaning helps.
What causes the Webasto circulation pump fault code and overheating error?
The circulation pump fault code points to an open circuit or short circuit in the pump circuit. A seized or broken pump makes the heater overheat and shut down, and replacing the pump usually fixes it. An oxidised wiring harness connector can also cause the fault.
How do I reset the Webasto lockout?
The lockout (for example after overheating or a flat battery) is cleared by disconnecting the Webasto power supply for at least 10 seconds and trying again. The fault state can also be cleared with a diagnostic tool. Timer start does not work if the outside temperature is +5 degrees or higher.