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hi, my worchester 9.24 electronic is working fine when i use it for hot water, but when i turn on the central heating it runs for a short while approx 1 min then cuts out then restarts runs for another min cuts out again over and over again. i suspect a thermostat. but which one and where to...

i have a old boiler which has run with no problem for the 3 years i have been in this house, on 0.5 bar. the boiler has no filling loop and no sign of anything discribed on this forum. i want to change 2 radiaters but i,m worried i will loose all pressure and have no way of putting pressure in...