Webasto Thermo 50 Heater Service Manual

A Webasto Thermo 50 is an auxiliary heater fitted to cranes and heavy vehicles. It warms the cab or the engine coolant before you start work, so the machine is usable on a cold morning. When one quits or runs rough, the person with the wrench needs workshop-level procedures, not guesswork. That's who reaches for this manual.

What this manual helps you do

• Diagnose a heater that won't start using the fault symptoms and error messages sections.
• Check control unit wiring with the connector pin assignment for the Thermo Top E and C.
• Follow the functional checkouts to verify the heater runs correctly after a repair.
• Replace the circulation pump on the Thermo Top E and C, or remove and install the timer.
• Rebuild the heater by following the heater disassembly and repair sections.

Who this is for

Crane service technicians, rental fleet mechanics and independent repair shops who fix heaters in-house. It also suits plant maintenance staff working on a machine that arrived with no paperwork.

FAQ

Q: What do I receive and how is it organised?

A: You get the set: 2 PDF files, 90 pages in total, in English and German. Publication 63378C_EN is the main manual at 46 pages, and Publication 67989A adds another 44 pages.

Q: Which heater does it fit?

A: It is written for the Webasto Thermo 50, and the same manual also covers the Thermo Top C, Thermo Top E and Thermo Top Z. The title on the manual is Thermo Top Repair Shop Manual.

Q: How does it fit the job I'm doing?

A: It's the complete manual for this heater. You'd expect to find technical data, troubleshooting, servicing, repair and installation details such as the fuel supply, dosing pump position and exhaust pipe outlet position, all in one place at the bench.

Pull up the manual, work through the troubleshooting and functional checkouts, and get the heater running again in your own shop.

Click here to view the preview (PDF)

Models covered by this manual

This service manual is also used for 3 further Heater models: Thermo Top C, Thermo Top E, Thermo Top Z. Check the model and serial number on your data plate before ordering.

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