Rinnai Vent Free Gas Heater/ "valve turn cooktop" Questions

turn on the hot water tap, we hear the pilot trying to light, and a fan going, and we have turned the gas inlet valve and the water valve to the on/open position (both at the meter, and locally at the

...seems to fix the fault get a gas fitter to change the regulator. Make sure all taps and isolattion valves are fully on. I'm have assumed this is not a new installation so the unit has worked ok ...