Warning W02: water level insufficiency of water tank
a) This failure may be resulted from the improper operation. First, judge whether the failure is ascribed to the “water level insufficiency of water tank”. Add the moderate amount of deionized water to the Product with the corresponding tool. Confirm the current water level through the liquid level observation window at the side of the Product.
Note:
① The deionized water must be added. Any mineral water or tap water is forbidden.
② It is allowed to add water under the charged state. When water level reaches the required value, the prompt dialog box shall be automatically eliminated.
③ Overflow may happen if excessive deionized water is added.
b) If the problem still exists after the above steps, take apart the back cover of instrument and the main control boards J4.3 and J4.4 of main console with tweezers. The alarm should be eliminated at this time. If, however, the alarm is not eliminated, it is the failure of main control board of main console, and please try to replace the main control board of main console.
c) Failure may happen to the instrument line if the alarm is eliminated. Check the state of “main control board D39 of main console” (the indicator lamp is in the “off” state when “water level reaches the standard”. If the indicator lamp state does not comply with the reality, confirm whether the corresponding wiring harness is loose and whether any line is broken according to the “wiring diagram”. (Where J4.3 and J4.4 have short circuit after “water reaches the standard”, use a multimeter to help test line connection/disconnection.)
d) This failure may also be ascribed to the liquid level sensor failure of water tank (the failure possibility is very low). First, check the installation direction of liquid level sensor and confirm whether the arrow is upward. If the installation direction is correct, dismantle the sensor (drain the water before the dismantling), change the state of tail testing end manually and check whether the state of “main control board D39 of main console” changes accordingly. If there is no corresponding change, judge it is the failure of sensor and replace sensor; otherwise, try reassembling the sensor and check whether the failure has been resolved. 
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