Low air flow from ac/furnace diamond york 80 model?

Obviously, you have an air flow issue. Low airflow is why the thing was freezing up, more than likely.

Either your blower motor is running slow or not at all due to it failing or having a bad run capacitor, or you have a blockage of some sort. Blockages of air flow can result from a dirty filter, dirty coil, a blower motor that is running slow or not at all or the lack of enough return or a return that is blocked. It is also possible to close off too many supply registers.

I would also like to point out that if the thing happens to be frozen up, very little air will move through the system. This is because the evaporator coil is a big block of ice when it freezes, which blocks most of the airflow. So, to make sure it isn't frozen up when you check the air flow, check the system after it has been off for at least 2 hours.

Basically, with the info you have provided, that is about as far as we can narrow it down at the moment.

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Low air flow from ac/furnace diamond york 80 model?

My furnace is 9 years old, last summer i noticed the central air unit line into the unit was freezing up, well it was the end of summer so I didnt really worry about it. Through winter I noticed I had very little air flow through the furnace and this summer when I turned on the air it has the same...

That same air flow has to go through the evaporator coil as well as the heat exchanger..... Gain access to the under side of the evap coil and clean it. Use Clorox Cleanup, and a brand new dollar store toilet brush. DO NOT bend any fins over. Pull with the grain of the fins. Rinse well with a miscellaneous spray bottle of water, and while you are in there make sure the condensate drain is clear.....

Also, get the whole fan capsule out of there. The small concave blades of the squirrel cage fan get caked with microdust. Get that clean and you will notice a difference. Guaranteed.

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Ignitors are finicky things. They cannot necessarily be proven with a VOM as they are made from a carbon based material that even a fine crack may show continuity but when carrying a current, they open the element up right away. If they get touched on the heating element surface during installation by a clumsy HVAC tech's fingers no matter how clean they may be will deteriorate rather quickly by failing from the hot spot of finger prints. If you got 2 years you did well. I've seen them fail within a month from customer installations. You can check them with the VOM and it may show no continuity by checking the two leads, of usually three including one of which is the flame sensor. Prices vary as wholesale can be about $85 where I am.

If it was replaced with a cheap ignitor than yes 2 years is all they last. Turn power off to your furnace. Unplug ignitor or undue marettes joing wires together. Using a voltmeter set to at least 120 volts plug leads into plug. With thermostat turned above room tempurate turn power to furnace back on. Wait a bit. Power venter will start. After a few seconds you will get a reading of 120 volts on meter. If yes than ignitor is done. If not than you have another problem.