Hisense FSN535A20D User's Operation Manual page 27

27
Water dispenser
is not functioning
You can hear
water bubbling in
the refrigerator
Is the water line connected and the water valve open?
Has the water line been crushed or kinked? Make sure the water
line is free and clear of any obstruction.
Is the water tank frozen because the refrigerator temperature is
too low? Try selecting a warmer setting on the display panel.
Check if the filter is properly installed. If it is not properly installed,
the water dispenser may not work.
This is normal. The bubbling comes from the refrigerant coolant
liquid circulating through the refrigerator.