Hi, My boiler is indicator/diagnostic (blue) lamp is flashing. No regular pattern, neither slow nor fast just flashing regularly Reset doesn't cure it. Then it seems to settle down (after 5 minutes or so) & start working for a few hours. This boiler has been troublesome from the start (installed about 2 years ago) It required monthly resets, during the winter months, to clear flashing lights. However after 5 visits from WB without fix and stone walls from the installer have just got used to it. This problem is different - it seems to recover now. I'll ring local firm boiler firm on monday to arrange a visit. However any opinions in advance as to what it might be would be gratefully received.