Ac Blower Fan Not Working In Auto Mode

My home ac fan blower does not work in auto mode but it does work when i slide the switch to on.

Ac blower fan not working in auto mode. I can also turn the fan mode to on and the fan will run. If i have problems still i will return. As a side note i was a bit worried of fire if the blower did not turn on. Fan will not come on in the on position or your fan will not come on when you turn the thermostat down in the air conditioning mode.

I read somewhere the blower had a 4 min count down before turning on again. The heat and fan worked well over winter. The inside fan doesn t run when in auto mode. If i turn the system on with the fan on auto the fan will never spin up but the a c does make noise like it s doing something sorry for the laymans jargon but i m not the most experienced with hvac stuff also if i try to switch the fan to on after the a c is already switched to on the fan still does not turn on.

Maybe i was just impatient before when i was testing it. All the wires in the thermostat seem connected so i am at a lost for the cause. Is the thermostat not working correctly or something in the ac unit causing it to do this. The ac compressor outside works fine.

Test to make sure you are getting 24 to 28 volts ac between the g green and c com terminals on you fan center or control board if you aren t getting 24 volts between g and c then you might have a thermostat problem a thermostat. If i leave the fan on then the ac works fine cooling correctly. The outside unit keeps running when cool on. However if the system is in cool mode and the fan is set to auto nothing happens.

I swapped out the circuit board but the same problem persist.