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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...

does that mean it will automatically fill itself from the header tank and i have no way of increasing the preasure manually

it does have a 22mm pipe which comes out the top of the boiler and runs into the ceiling and back into the house, not sure where it goes. but the boiler works great and is economical so see no point in spending money replacing it.

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...