Problem with Goodman Furnace flaming out. After it has been off for about an hour it will flame out after it starts and runs for 5-10 min before it satisfies themo setting. Restarts and finishes cycle. Next time it will usually run thru cycle. Pipes are two inch and run 31 feet out back of condo. Will run fine after a few cycles.
This is a Gas Furnace. Goodman GMSS960603BN Model no. 96% PSC UF New. Single stage,up flow. Has 2 inch pipe that runs out the back of condo. 31 feet. Two pipes, intake air and vent pipe. Manual say can use 2 inch pipe with 4- 90 degree elbows and run 30 ft. HAD 2 TECHS that say it is pipe problem. Why will it run full cycle most of the time. Then act up after it has been off cycle for about an hour or longer. Condensation water is draining. No kinks in hoses in furnace. Flame out t(All burners stop producing flame. Since is new pressure switch and control board have not been checked. I now have intake pipe off and use house air to get heat. Getting ready to have a 3 rd tech come in and go over everything. Any suggestion to tell him, will be appreciated.