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I have the above system boiler and have recently noticed a rapid, quiet "ticking" noise which seems to be coming from the PCB / user control panel area. It's only noticeable when the utility room is otherwise silent and continues whether there's a call for heat or not. It stops immediately...

Hi, System was installed about 6 years ago with no problems until this week. We were unable to set alarm 2/3 days ago with all zones lighting up on keypad when attempting to do so. All lights were also illuminated on Nova IV remote receiver, which I thought may be because of batteries...