I have a goodman gas furnace gmh 1155. The exhaust fan comes on for two seconds and goes off. Igniter nor gas come on. Control board light stays stray red. Is this s pressure switch or hose problem

Hi When the fan is going on and off does the call for heat (check for 24 volts from W to C) Stay or go off also?

If the light on the control board never changes from start to finish with out a fault code you have a bad control board.

I jumped connection and works. Thermostat is problem. Cleaned contacts although didn't look dirty. Works fine