A number of years ago we purchased a Vitoladens 300C BC3 oil heater. Since 2019 we have had continuous problems. The unit stops with error message FB or FD. After a restart it works for some time, then stops again. The time between problems varies - sometimes the system works for a few days, sometimes for a few hours, sometimes it does not restart at all, and stops after a few attempts. We had different plumbers investigate the problem - they change the injector and perform maintenance, but so far nobody has been able to resolve the problem. The motherboard and fuel pomp have been replaced, tests have been performed with a direct feed from a jerrycan. We are about to give up and install a heatpump (in France a replacement of oil system is no longer allowed). Anyone an idea what might cause this issue? Any suggestion is much appreciated! Ben
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