I got a used machine that had been sittign for years. On the first several tries to power up, I got that error message a short while after powring it up. My water jug is installed externally for easy access, and I could see the water wasnt getting up the hose all the way to the machine. So I elevated the water jug by placing it on top, then the water fed and the message didn't appear. This may not have much to do with your situation, but maybe it will help. (Maybe error 2 relates to water shortage) You could remove the back panel and see if water is filling the tubes. (Caution with hot wires)
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There is a tiny plastic one-way valve in the brass tube on the pump under the top cover that get calcified and stuck when not in use. A good pump will fill the tubes in 2 seconds. Lay all your parts slowly and carefully in order during disassembly. The brass tube with the valve in it unscrews from the angle fitting. Press the little plastic white tab to release rubber motor mount and slide the pump out. Yes it is kind of a technical repair. Unplug unit before starting. I used a toothpick to get the valve out after disassembling the pump and its hoses.
I just took mine apart, and put it back together. Of the three holes for the screws, there are two smaller and one bigger hole. Align the larger hole on the filter and the base, and the tiny plastic bit and the spring go in to the larger, along with the hollow and larger screw.
Mine is a red O-ring about 2 1/4" diameter, the same as some automotive brake calipers. A well equipped mechanic or parts store like NAPA should have a supply of O-rings with the proper size, best to take your strainer in to test fit.