My boiler: Weil-McLain CGi-4E Series-2 gas boiler.
Here is what is happening now.
The third led (LIMIT) is flashing and the boiler won't fire. The first (power) and second (circ/tstat) LEDs are solid. Shuts of after 15 seconds and restarts after 30 seconds. Sometimes it may get fired at second or third attempt and keeps running as normal until the heat call ends. Again when the the next call comes the same problem happens.