My boiler is kind of playing funny buggers. But I am not sure its the actual boiler. Its a condensing boiler and it keeps failing to fire up, now I thought it was because the pipes were frozen. But its been working fine and the thermostat circle that you turn to alter the temp got knocked off. I don't know how to make sure its back on in the right place, plus since this has happened the boiler hasn't fired up properly or maintained a constant temp. Anyone with any ideas before I get someone out?? Can the thermostat not being on proper affect the boiler firing up??