Circulation pump Webasto Thermotop

Hello,

Can anyone tell me how to determine if the circulation pump of my auxiliary heater is faulty?
Is something considered defective if I don't have a diagnostic tool?

What is the price of the circulation pump? Besides Bosch service, where else might I be able to find it cheaper?

Greetings.

Flatscher.

Can anyone tell me how I can determine if the circulation pump of my auxiliary heater is
Is something considered defective if I don't have a diagnostic tool?


Your eyes, ears, and hands will tell you. Self-diagnosis only provides information about the electrical functionality of the pump or the line, or whether it has been damaged or burned out (by analyzing the current).

You can only determine if the pump has a bearing problem, is leaking, or is running abnormally by listening carefully, and possibly by observing it. Expansion / Measurement of pressure and flow rate.

According to the maintenance documentation, in the event of complete failure, you can measure the resistance of the motor winding and check the output of the control unit. The plugs are all accessible on the top side of the heater.

CU

Hello,

I checked it out.
The hot water outlet of the heating system (supply line) remains cold.
The water inlet (return) of the heating system is getting hot.
The blower turns on much earlier than it should during normal operation.
There are strange noises coming from the heating system and the return pipe.
It sounds like the water is boiling.

After a short period of operation at full power, the heating system will then switch off.

When the engine is running, everything is okay.

I suspect the pump is defective because no water is circulating, which causes it to overheat and the heating system to overheat.

I also disconnected the motor connector from the control unit and applied 12V to the motor, but there wasn't much activity.
The resistance of the motor winding was approximately 300 ohms.

I would appreciate it if you could provide more information.

Greetings.

Flatscher.