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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a vitodens 100 supplying house and domestic hot

Customer Question

Hi my name is***** have a vitodens 100 supplying house and domestic hot water- showing a fault code for , unit will not start
Submitted: 1 year ago.
Category: HVAC
Expert:  Rick replied 1 year ago.

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.

An ff code is a blocked burner issue. I'm assuming you've cycled the power off then back on again to reset the control. The cables and ignition electrodes need to be checked. A strong EM field nearby could be interfering with the electronics. If the problem persists it's recommended to replace the control unit.