i have now had a man from aardvark who has checked the system over and its all in working condition but now it looks like the probleem is with the programmer which is a sunvic select xl...
i have been having such a nightmare with my central heating and its even baffling the so called experts.before christmas i had to have the red cylinder on the immersion heater replaced as it was faulty and within the the week my central heating started playing up...i would advance the heating...