Prolly the only problem would hav ebeen lower efficiency, as the 168° water would help rinse the sugars more thoroughly. Other than that, a lower temp than 168° is CERTAINLY better than a higher temp. If that was the worst of your problems, your beer will be fine.
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Lower temps make a more fermentable wort. It will likely have a very low FG. Might have a little dryer taste but it should be fine.
In the future you should have some water heating on the stove (just a few quarts) so that if your mash is low you can add some very hot water. Or you could make a heatstick which works better if you have a smaller mash tun.