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Could be presure switch set too low.
But if you didnt touch it it had to be bumped.
Could be low on oil or oil too thick from cold.

 

It's running now, I don't know if it was ice in the regulator or one of the things you mentioned. I let it sit inside overnight and most of the day and it took off and ran like a champ. Drained the water out of it so hopefully it won't happen again!