I have a 20 year old R380 Pilote campervan. It has a Leblanc water heater. The water heater had a burst so I carefully removed the heat exchanger unit and had it repaired today. I was especially careful not to disturb the gas burners. I did have to undo the two pipes going to the pilot light, but was careful not to damage or bend these.
I put the repaired heat exchanger back and carefully replaced the pilot light gear. I was then able to light the pilot light and flash up the water heater but, when I shut down, the burners continue to burn at a very low level and won't switch off unless I disengage the master switch. Does anyone have any tips or advice.