Gas supply keeps cutting out

Flame detector's given up, mercury pressure developed from flame heating a small bulb and capillary pipe keeps gas flowing, they seem to fail over time. Not developing enough pressure and thus giving regulator a false flame out reading. dilonghi call them analysers. No fix - fir replacement prt

I'd be checking what the operating gas pressure is correct - when it's operating, not when it's stopped or off. My suspicion is that the gas pressure is incorrect & the regulator needs adjusting, or that the gas bottle is simply too small for the heater & can't evaporate enough gas to keep it going. You really need a gas expert to advise on site. Regards, Greg (Aussie gasfitter - too far to do house calls)