Looked and tested glow coil and is fine. Glows in testing mode. Fans run. Thermostat is sanded and clean. Filter changed. End of my knowledge it runs fan for 60 to 90 seconds and shuts down. Glow coli never glows. In component test it will glow. Any direction anyone can give me? At thermostat it acts like it turns on. Furnace does nothing. When entering into testing mode flashes code 11. Thanks. Code is just all things have been reset. Now solid light no codes blink. Fan turns on but no glow coil lighting up unless in test mode. Referred to codes earlier nothing useful at this point which is more frustrating. But thanks for helping. P

The code index is inside the air handler cover.

Does the inducer fan (the little fan in front) run? If so, then you might have an obstruction in the vent pipe. Or it could be a defective pressure switch.

Theory: When your thermostat calls for heat the draft inducer should start which creates a draft in your vent pipe. If your vent piping is open and your pressure switch is working properly the pressure switch will send a signal to the control board allowing the hot surface ignitor to glow. If the pressure switch does not close, everything shuts down.

I have TEMPORARILY tested this by shorting across the pressure switch to see if the furnace comes on. However, you MUST figure out why the pressure switch is not closing because if the vent is blocked it is dangerous. DO NOT LEAVE IT THIS WAY.

Here is a good description of what I'm talking about:
https://www.arnoldservice.com/proble...board-problem/

Best of luck. And heed my warning.
WallyH