Hello, this heating season I have a problem with error C6 (turbo stove). I know it's a pressure switch, it doesn't draw enough air. There is no rule for this error, one day everything is ok, another crashes every now and then on CW and CO. Once in the morning there are problems, and in the afternoon ok.
I sketched what my chimney duct looks like

I'm afraid that the suction pipe unnecessarily ends right in the brick chimney. Now I thought that maybe I could try to raise the protective roof over the chimney a little, but I'm away from home so I won't do it for now.
There was a service technician (unfortunately there is only one in the area), he removed the furnace casing, blew into the hose and that's it, the problem repeated. He advised me to unscrew the caps on the top of the stove, but I think the guy talks nonsense. Of course, it would probably help, but the stove would no longer be with a closed combustion chamber, that's not the point.
Press him to replace the pressure switch, or look for the cause in something else?
Last winter it was ok.
I sketched what my chimney duct looks like

I'm afraid that the suction pipe unnecessarily ends right in the brick chimney. Now I thought that maybe I could try to raise the protective roof over the chimney a little, but I'm away from home so I won't do it for now.
There was a service technician (unfortunately there is only one in the area), he removed the furnace casing, blew into the hose and that's it, the problem repeated. He advised me to unscrew the caps on the top of the stove, but I think the guy talks nonsense. Of course, it would probably help, but the stove would no longer be with a closed combustion chamber, that's not the point.
Press him to replace the pressure switch, or look for the cause in something else?
Last winter it was ok.