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DIAGNOSIS AND SOLUTION (CONT)
E1 (Indoor and Outdoor Unit Communication Error) (Cont)
Remarks:
S Use a multimeter to test the DC voltage between the outdoor unit’s 2 port and 3 port. The red pin of multimeter connects with the
2 port while the black pin is for 3 port.
S When the air conditioner is normal running, the voltage is moving alternately as positive values and negative values.
S If the outdoor unit has a malfunction, the voltage has always been the positive value.
S If the indoor unit has malfunction, the voltage is a fixed value.
Fig. 17 – Multimeter
S Use a multimeter to test the resistance of the reactor that does not connect with the capacitor.
S The normal value should be around zero ohm. Otherwise, the reactor must have malfunction.
Fig. 18 – Multimeter
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