Viessmann boiler error code 981

This section will provide the necessary information on diagnosing the viessmann boiler error code 981.

Reason for the error code: The viessmann boiler fault code 981 is typically generated when there is a problem with the return water temperature sensor.

Steps for diagnosis:

1) Check where the sensor is located.

2) If it’s on a hot water pipe, check whether there are any leaks in these pipes and fix them if necessary.

3) If it’s on a cold water pipe, check to see if there are any blockages in these pipes and clear them if necessary.

4) If it’s at the base of your boiler tank, ensure everything is clean and that your condenser coil has been cleaned out regularly.

The error code 981 is a boiler fault code, which can be found in the Viessmann boilers. It means that the boiler control board is not connected to the power supply and can’t function properly. In this case, you need to check your area’s mains voltage and ensure that it is not too low or too high. As well as check your fusebox for any signs of damage or shortages. If you don’t find any problems with these, contact a service technician who deals with Viessmann boilers.

The boiler is not functioning properly, or the boiler won’t turn on at all

Viessmann Boiler Error Code 981 – Indicates failure to light with one or more zones of burners. This is a wiring error. Check for a high voltage at the coil for the zone and make sure there are no open, shorted or reversed wires in the coil area. Defective wirings, such as loose connections or improper wire gauges, can also cause it.

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