Just noticed that my furnace tries to start and fails. Ignitor starts, gas value opens and flame ignites, it stays on for 4-5 seconds then the gas shuts off. The furnace tries 5 times. Furnace is a mid efficentcy gas two stage.
The error code is "8 FLASH" flame is lost 5 times during a heat cycle. Could be caused by low gas pressure or faulty gas value.
I'm pretty sure that the gas pressure is fine, I would like to clean the gas value if possible or applicable.
Less then a year ago I had to get a professional to replace the pressure switch because it wasn't closing correctly and then cost a few bucks and I don't really want to do this again.