
Hiya, sorry to hear about the problems. My hubby is a plumber. He says it sounds like an airlock. He said to turn the heating off. Turn off all the radiators which are currently working. Then turn the heating back on. He said that this then should force heat into the radiators which are out of balance.(which are not working). If the radiators have TRVs (thermostatic radiator valves) take the top of the TRV off and check the centre pin is all the way out. My hubby said the worst case scenario is that the pump is on its way out (if you have an unvented system (a system with a hot water cylinder in the airing cupboard- there will be a pump in there)
Have you had any work done recently where the heating system has been emptied?
Call outs do vary dependant on the company. The approx price is 40-60 per hour plus parts. It may be worth you contacting British Gas or another company like that if the above info doesnt work as I think you can pay a monthly fee to cover your heating system each year.
Fingers crossed the info works and it is just an airlock. xxx