Viessmann boiler 100 fault code f1
Viessmann boiler codes and the meaning of each code.
All Viessmann boilers have several fault codes that help diagnose equipment failures. F1 is a power cut or intermittent power supply. F2 can be a weak flame caused by improper ventilation, too high or too low fuel pressure, insufficient fuel input, ignition failure or dirty burners.
Fault code f1 is the “High-Temperature Limit” message. This means that the boiler control module has detected a temperature rise over the set limit. The user controls the upper limit, which can be changed through programming with the E2BUS or by setting it on-screen via remote control.