Hi my name is ***** ***** if you go to the following like and look for the RWB7 it gives you the set up procedure for the timer. If you need further information come back to me -- http://www.knh.org.uk/yourhome/runningyourhome/centralheatingcontrols.shtml
First thing have you bled the radiators?
So are you saying you have storage heaters?
OK standard water filled radiators that need bleeding first off. Understand the system, you have a boiler which heats the water then pumps it around the pipes and through the radiators. The radiators then get hot and heat the room. If you have air in the radiators they you get reduced heating. Secondly the boiler will be controlled remotely or by its own controls. Do you have any electrical test equipment such as a multimeter?
You will need a radiator key from a local hardware store - it you then look at one of the ends of the ratiator at the top you will see a square nut. with a towel handy unscrew the bleed screw a little and you should hear air coming out. When water starts coming out close the nut tight and move to the next.
OK Im here until 11pm with just a break for lunch and tea - so leave me a message and I'll get back to you
Is the boiler running?
OK is the red light on the boiler or the programmer?
What is the make and model of your boiler?
OK attached is the installation handbook for this model - if you go to page 22 it gives you the procedure to test and reset the boiler. From what you have said you have a problem with the boiler itself not the programmer or radiators.