Purchased a product on Amazon called clean-night complete cpap spray worked well for me, my wife smokes and my machine had a bad smell every night, use this stuff about 2 times a week. Works well. You spray it on mask and on the filter, works quick.

I currently use a respironics series one auto cpap, The machine runs great for 3-4 hours and then shuts down in the middle of the night and SERVICE comes up on the led display, Any thing I could try or does anyone know why?

I bought a product from amazon called clean-night from amazon, worked well for me, easy to use too, just sprayed on the filter and smelled good.