Scania MBS DTC 852 Auxiliary heater, flame monitor

MBS MBS control unit · Scania

Code 852 (decimal). Some diagnostic tools show it in hexadecimal as 0354.

In short

The auxiliary heater has detected a fault in the flame monitor.

Applies to: MBS3 (MBS)

What does Scania MBS fault code 852 mean?

The auxiliary heater has detected a fault in the flame monitor.

What causes Scania DTC 852?

- Dirt in the flame monitor. - Fault in the connection to the flame monitor.

How does the system react?

- The auxiliary heater switches off. - A yellow warning indication is displayed.

What are the symptoms?

The auxiliary heater does not start or stops during operation.

How to fix Scania MBS fault code 852?

  1. Check the flame monitor and its connection.
  2. Check whether the flame monitor needs to be cleaned.
  3. Check the auxiliary heater function using the Workshop Manual for the relevant auxiliary heater.

This information is for guidance only. Always follow the manufacturer workshop manual and safety procedures; if in doubt, contact an authorised workshop.

Code 852 in other Scania systems

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