Thanks for the reply and the additional information. The draft inducer (electronic inducer) has a tube connected to it that goes to the pressure switch. The pressure switch checks for the correct air flow in the duct. After the pressure switch stops the furnace from operating 3 times it will cause the lights to flash and the furnace will have to reset to try again.
The tube that connects the draft inducer to the pressure switch can get dirt in it. This will cause the pressure switch to shut the furnace down. The ports that the hose connects to can get stuff in them also. This can be cleaned out using a small wire. Do not blow into the pressure switch or it will be damaged and will need to be replaced.
Other things that can cause a problem with the pressure switch shutting down are dirty filters, an A coil that needs to be cleaned, any blocked return air vents, dirt on the draft inducer blower blade, dirt on the furnace blower blade and a obstruction in the chimney that would keep the chimney from getting a good draft.
I believe one of these are causing the problems you are having.
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