Webasto heater doesn't start up

The most common issue with air heaters is that they struggle to start up properly.

This usually happens because of a fuel supply problem. Start by checking the fuel lines for any air bubbles, leaks, damage, sharp bends, or kinks.

Next, make sure the heater is drawing air from a well-ventilated space. Installing it in an enclosed or poorly ventilated area can cause overheating and other performance issues.