Viessmann boiler fault f2

Viessmann boiler fault f2

This error may indicate the following:

  1. Faulty burner
  2. Tripped temperature sensor

Check the amount of water in the heater and the circulatory pump. Drain air from the unit. Check the temperature limiter and cables. To unblock the system, turn the “tr” know almost all the way to the right and them back to the left (reset).