Why is there no gas flush in my Koch Ultravac 250?
- EEmily OwensAug 12, 2025
If the indicator light (GAS) is lit, check that the gas pressure going into the gas inlet is correct and ensure that the gas flush valve (SOL-3) is working properly. If the indicator light (GAS) is not lit, check the gas flush potentiometer on the analog control module or a possibly defective digital control panel.

