Something to bear in mind with the ultraheat element, It is a common for it to cut out when the controls are on the wardrobe above the fire, I had this issue initially when it would cut out when the inside of the wardrobe reached the set temperature. You can buy a temperature override kit, it just plugs in at the bottom and then the thermocouple bulb is strapped the the bottom of the gas fire. It works really well, I got mine from Arc systems, it came with a very easy to follow instruction sheet.
http://www.arcsystems.biz/