Haier 1U50REJFRA Service Manual

Service diagnosis35 Domestic air conditionerIndoor Display ■ □ ★/E14Method ofMalfunctionThe rotation speed detected by the Hall IC during fan motor operation is used to determineabnormal fan motor operationDetectionMalfunction when the detected rotation feedback signal don’t received in 2 minutesDecisionConditionsSupposedCauses■ Operation halt due to breaking of wire inside the fan motor.■ Operation halt due to breaking of the fan motor lead wires■ Detection error due to faulty indoor unit PCBTroubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector, or elseparts damage may be occurred.Check whetherterminals on indoorpcb is wellPull out the terminals onthe indoor mainboard andreinsert them.Turn off power switch,and pull out the fan motor.Measure t h e resistanc e s between b a l c k l i n e ( 0 V ) and w h i t eline(15V) ,balck line (0V)and red line(310V) of indoor fan motor .The resistances range isbetween 30KΩ with2MΩThe indoor fanmotor is damagedand need replaceNOYESNOYES the indoor pcb is damagedand need replace10.3.3 Indoor DC fan motor malfunction