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Buderus GB142 venturi issue
Replaced a broken venturi to help solve intermittent 6A code. With new venturi of the correct size boiler goes to a 6A lockout. The only way to get it to fire at all is to block about half of the air intake (it then fires for a minute or less and gives a 6L code. Put broken venturi back in with old gaskets and it fires and runs, so far with no error code (only a few firings so far). Any thoughts? Thanks