Viessmann boiler error 51

Viessmann boiler error 51 is a code for various problems with the water circuit. As of now, it is not clear what the exact cause of this issue is, but there are potential reasons behind this error. Some people have suggested that some kind of contamination in the water circuit might be responsible for Viessmann boiler error 51. In contrast, others have said that an interruption in electricity or a malfunctioning electronic module could cause it.

It is an error code that is generated by the boiler control board. It is not a code that a heating engineer will specifically recognize, and several different faults can cause it.

If the boiler has been in service for more than 5 years, it may be more difficult to diagnose the problem just from this error code, as components in the boiler can wear out with time.

The most common problems identified by an error 51 message are:

– The power supply to the system has been interrupted. Check for blown fuses or tripped circuit breakers;

– The water feed solenoid valve has failed, causing the system to shut down;

– The flame sensor or primary air sensor has failed;

– The pressure switch has failed and cannot maintain sufficient pressure in the system.

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