brand: RUUD model# serial# 5156 M4693 6299 my emh setting doenst put out heat at all. every 15 seconds or so it makes a clicking sound. do i test the elements at 200v setting or 20v setting on the volt meter? And the heat pump runs all day long at 78 degrees because the house will only get up to about 75 degrees. bill was $381..thats a 120% increase from last month. On a separate note when i first moved into the house the pressure switch would trip when using the AC