new gas valve fitted ok, boiler fires up and after few mins cuts in out rapidly, firing up shutting down this will cont till turned off hence the need of new gas valve help
The problem may not necessarily be associated with the gas valve. You will need a corgi registered engineer to repair this fault.It may be the boiler overheat thermostat that could indicate a flue problem (if you have a conventional flue then it is possible that products of combustion may be escaping and therefore extremely dangerous).
My advice is to call a corgi registered engineer urgently and not to use the boiler until the problem has been resolved.
