I'm not overly familiar with the D16 but the click has almost gotta be the dialler, is the system monitored? If so, is the control room receiving anything? If you've power cycled it and that hasn't cleared the fault I'd next be seeing if defaulting the panel will clear the fault... or, do you have a standard codepad to try in place of the touchscreen? Being 38º shouldn't be a problem, well not unless the panel is inside the ceiling space I suppose.
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