Try the starter juice. There's a ton of possibilities here and an error code look-up would probably get you closer. But if condensate froze in the line or pump and is now melted you might be able to push it thru if you can keep the motor running. I try the cheap stuff first.

“When Tyranny becomes Law, Rebellion becomes Duty”

Colossians 3:17 (New King James Version)
"And whatever you do in word or deed, do all in the name of the Lord Jesus, giving thanks to God the Father through Him."