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I have a buderus g125/be oil boiler. during winter operation, I have no problems with boiler during winter months. But during summer, i use boiler for domestic hot water only. this problem only occurs during summer months. if the boiler goes a long period of time without firing and then has a call, it does not fire and I get a display on logamatic 2107 that states "BURNER ERR". If i push reset button, burner fires and all is fine until it happens again at a later date. It almost seems like it looses its prime but last time tech was here he said prime was fine. direct vent outside in case anyone is wondering.