Swap a radiator on a combi boiler.?

uming you isolated the boiler before commencing work, reopen flow/return valves beneath & charge the system up to 2 bar via filling loop. Bleed the towel rail and any rads. Ensure system has 1-1.5 bar in when this is done. The auto air vent on the boiler will bleed any air. Run the boiler without heat (no gas) to prevent any possible damage to heat exchanger (incase air in there). You will have to reset the boiler 3 or 4 times after the flame failure kicks in. All we want is the pump to run for a minute or so. When this is done check gauge/top up turn the gas back on underneath and you should be ok.