Hi Les,
OK, so the heater is working.
The best way of using the ultraheat is to select a temp of 5 or 6, make sure the fan is OFF and select the 2000 if it is cold, but remember to take account of the ambient temperature.
Wait until the heater is producing a good amount of heat before turning the fan on and then only at slow speed.
You have to bear in mind that you are passing cold air over an electric element, and it will draw all the heat away if turned on too soon and will feel as if it is not working.
If you need instant heat, use the gas to bring up to temp as the electric is heating up.
Remember too that depending on where the temperature selector switch is located you may suffer from the electric heater getting up to temp, then cutting out for longer than it should, as the thermostat is located inside the switch.
If this is a problem ,it is an easy fix to have a remote sensor fitted, if still in warranty, by the dealer.