- Jan 25, 2013
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- Since 1991
My Sergeant EC155 power supply has recently started to make what can only be described as a "whirring alarm clock" sort of noise - but only intermittently. It seemed to have started when the 240 power supply was interrupted during a power cut. I had no idea what the noise was and it only stopped instantly when I turned the switch off on the unit after being baffled and bemused at 0200! In the morning, I switched it on again and the noise stopped until 0100 this morning when it started again. This time when I switched it off, the noise died gradually until it finally stopped. I have read, and re-read, the instructions to the unit and it makes no reference to this "Alarm" (??). Does anybody know what I'm dealing with - please! I need to be able to sleep at nights!