http://m.youtube.com/watch?feature=c4-feed-u&v=iVSUKlcBeiU
Changed the gas valve, central heating flow limit thermostat and safety overheat thermostat, ch and dhw thermistor and also the Venturi recently. This problem has suddenly arisen. Happens on initial start up, for about 30 seconds. Turns from a humming sound to an erratic woodpecker sound. I believe it to be the sound of the gas valve solenoid opening and closing. But am unsure. 2 corgi reg engineers cannot seem to diagnose. All help appreciated.[/url]
Changed the gas valve, central heating flow limit thermostat and safety overheat thermostat, ch and dhw thermistor and also the Venturi recently. This problem has suddenly arisen. Happens on initial start up, for about 30 seconds. Turns from a humming sound to an erratic woodpecker sound. I believe it to be the sound of the gas valve solenoid opening and closing. But am unsure. 2 corgi reg engineers cannot seem to diagnose. All help appreciated.[/url]
