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Viessmann Boiler FF Fault

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linton.jaw

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Evening,

wondering if any of you boiler engineers have any ideas. I had to move a bathroom radiator and couldn't do it without draining the system down. I turned the boiler off and then drained the central heating from a drain off. I completed pipework alterations, topped the water back up, bleed radiators (pressurised system) and put the boiler (viessmann 100) back on. I got a fault code FF. I reset the boiler but still keep getting an FF fault code. Any ideas? I can't see that I've personally done anything wrong or out of the norm.

Look forward to hearing your replies
 
Turn the boiler off and leave overnight sometimes they don't like being cycled on and off

If it still persists time to call a gas safe engy in
 
It sounds like you have drained the boiler too , it will need venting and or checking by a GS engineer.
 
Yup you need engineer, these boilers are sensitive to air
 
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