hello,,,i have just moved into a house a couple of weeks ago and it has a range powermax 155,,,the whole system had been drained down about a year ago,,,it is tank fed from the attick,,,all I did was open the valve coming from the attick tank turned it on and bled the rads and all has been working perfect until today,,,i went out this morning and turned the gas off at the mains as a precaution as I'm new to the property,,,anyway when I came in tonight I turned the hot water switch on to take a shower and after about ten mins realised the boiler hadn't fired an was on lockout,,,id forgot to turn the gas back on,,,now it just keeps going on lockout and wont fire even though the gas has been turned back on???,,,I cant seem to see a pressure guage anywhere to check the pressure either o does this model not have one??? as it is tank fed???,,,any ideas people???