The fan in the main console stops running in the ready state

a)  Use a multimeter to check whether the voltage is DC24V between the water quality testing boards P1.2 and J1.3 If not, replace the water quality testing boards.

b) Continue to check whether the voltage is DC24V between the water quality testing boards P1.2 and J1.4 with multimeter; if not, check the wiring harness connection of J1.3 and J1.4;

c) Continue to check whether the voltage is DC24V between the water quality testing boards J1.1 and J1.2. If not, replace the water quality testing board; if so, check the wire harness of J1.1 and J1.2.

d) Fan is of 24 V type. If no problem is discovered in wire harness, it should be the damage of fan. Replace this fan at this time.

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