Tori she made the hole herself,there is a path about 10 feet below the fence and she would spend hours put the garden watching what was going past. She also made a "viewing hole" through to next doors garden as well. Unfortunately she died in may last year,so now rather morbidly she is in a pot on our living room windowsill which was another one of her favourite places.LOL!
if you have got two motorised valves its a fully pumped system. Each valve actuator has an end switch which provides power for the pump and boiler (usually the orange wire). These switches sometimes stick, so when the valve body springs closed (the whirring noise you heard) the pump and boiler still run but there water has nowhere to circulate. The boiler actually boils which is the resulting banging noise you hear!
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