E904 - Samsung RC090MHXEA Service Manual

E904

E904 indicates a problem with the blue hot water cylinder sensor in the MIM control box
E904 only shows if field setting 3011 is set to 1 (unit has a tank)
To test this sensor press the blue set button until the tap icon appears, this will show the
temperature its measuring, if this reading differs from the tank temperature the sensor will
need replacing.
NOTE:
The tank sensor has a yellow plug, which goes into a yellow socket on the control PCB. It is
possible to put it in the red plug on the PCB, this will not work.
Wrong Correct
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