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Error Code E90 (Water Pump)
If the display indicates Code 90 & there is no water flow;
1. If only a click can be heard from the pump when attempting to turn on the unit, there is likely a
problem with the water pump. Check the water pump for any broken parts inside.
a. Refer to the control base open procedure to open the enclosure and base opening procedure to
open base
b. Disconnect water pump power cable. Unscrew brown nuts by loosening. Release the screw.
Disconnect the black power cord
c. Unscrew 5 screws on the pump to reveal the impeller and ceramic shaft. The impeller is magnetic
so pull it out carefully and make sure it doesn’t come in contact with anything sensitive to
magnetism. Check for broken parts.
d. Replace any broken pieces and reinstall the shaft, impeller, washer and rubber caps. Place a
rubber cap on the end of the shaft and add a washer over it. Insert the end with the rubber cap into
the water pump.
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