Junkers Cerapur Smart ZWB28 - Experiencing EA Error with Stove Functionality

Hello Forumers,
Tonight, an EA error popped up on the stove flashing alternately with the reset button and of course the stove was not working. After the restart, the stove started to work normally, i.e. it heated and heated the water. For about 2 hours to leave the house everything was ok. What could be the reason that it suddenly dumped this error?
I read that this may be a problem with gas, what worries me the most is the fact that I am leaving in a week and I'm afraid that this error will re-populate the lack of frost protection ...
Thank you in advance for your help and suggestions.

Check the condensate drain for trapping. The condensate must flow freely into the sewage system, possibly pull the pipe out and blow it towards the boiler ... Next, the contaminated boiler needs maintenance ... Next, the poor condition of the electrodes for cleaning or replacement .. Next something with the new horse system ... Next, gas loss or drop gas pressure .... or gas fittings (rarely).

Generally, it happened once and to this day (knock on) it has not happened again. Maintenance and cleaning was carried out before the heating season, i.e. several months ago. I suspect that maybe it was about some backflow from the chimney, because it was a time of considerable gales. I will watch and if it happens again I will check the things you wrote about.
Thanks for the advice.

serwisszulborski.pl wrote:

Check the condensate drain for trapping. The condensate must flow freely into the sewage system, possibly pull the pipe out and blow it towards the boiler ...

And it is this service that most often helps in my furnace ZWB 28-3C. The siphon collects dust, sand and generally sediment, so that the condensate cannot drain freely, and the oven enters EA error mode. Putting the condensation drain pipe to your mouth helps and blowing well until you hear bubbles and the condensate drains out.

Greetings,
L.

I confirm EA 227 no flame.
Cause: the boiler has not been started for over a year, the propane gas fuel from the cylinder lost its properties in the pipe only after the gas was passed outside the boiler, the boiler functions properly. Greetings