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fitter30 - Yes I did cleanup the air inlet filter, it was a bit dirty with dust etc.

hi all, I'm facing an issue with my Navien combi boiler CH-240. It provides both heating and domestic hot water with no problem. However, when heating is turned on, the navien keep igniting. It will ignite with a "woof" sound and you see the fire burning inside, and then after about 15 seconds...