Two questions:
One
I program my HW to go on at 0530 hrs and off at 0730 hrs, also on at 1630 hrs and off at 1830 hrs.
Every morning at 0555 hrs and every evening at 1655 hrs I hear the HW pipes creaking. I've experimented with changing the 'on' times, and the 'creaking' times just change accordingly, always approx. 25 minutes after the programmed 'on' time. Also, round about each 'creaking' time, the Thermostat display changes from orange to black, but continuing to show HW on. It's only when you get to the programmed 'off' time (0730 or 1830) that the display changes to 'off'.
Two
Programming HW on and off times brings up a silly clockface enabling you to set times to the nearest 5 minutes. But whatever times I try to set, they always revert to the nearest hour or half-hour - nothing in between, however hard I try. Is my thermostat faulty or is the clock face offering a timing flexibility that doesn't actually exist?
Does that mean that it's always taking about 25 minutes to get the HW up to the desired temperature? In which case, could I simply program 'on' periods of, say, 30 minutes instead of 2 hours?
