burners on armstrong furnace go out
The burners on an Armstrong forced air furnace (model no. EG6G150DC20-4) will intermittently cut out. Once they go out completely, the pilot light remains lit and the fan continues to run until I shut off the furnace at the switch on the unit. I've replaced the flame sensor and have called two HVAC companies, one that replaced the control board and the other the gas valve - both to no avail.
Sometimes the furnace will run through and complete the cycle. When the burners do prematurely quit, I can usually get them running again by turning off and on the gas valve and the electronic ignition ignites the pilot, which in turn will light the burners. Sometimes I have to repeat this multiple times to get through the cycle.