QUICK ANSWER
Dreame has a built-in repair sequence for this symptom.
Update firmware first, then use the hidden Base Station Self-Repair function while the robot is correctly docked.

INTERACTIVE DIAGNOSIS
Try the official recovery path
STEP 1 OF 2
Is the robot firmware fully up to date?
Do not manually pressurize the water system
If the official self-repair does not restore auto-fill, use service rather than forcing water through internal hoses.
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