I'm having a problem with my old 28yr old Lennox.
When the furnace runs it will run for about one to two minutes and then it will flame out,blower continues to run , it cools down and then it will re-fire.
So I guess the unit is running too hot?
To make a long story short a Tec came out,on the ticket he diagnosed it as a faulty gas valve,I replaced it and the problem still continues.
I call the company back out and Tec # 2 says the controller was bad so I replaced it.
The problem still continues.
Wile watching the unit go through it cycle last night I decided to pull open the filter door ,the unit continues to run as normal ,the problem goes away and it never goes off on high limit.
"The filter is new and there is nothing blocking the duct"
So I'm thinking its the blower motor or the Capacitor.But The motor spins freely and does not get hot.The capacitor looks ok but I have no Idea yet on how to test it or if even the will cause the motor to run slower or if this is the problem at all.
I'm so pissed with the company I don't want them back.
Could someone be so kind to head me In right direction,your thoughts or suggestions would be greatly appreciated.