Midea MCA3U-09HRFN1-M(C) User Manual

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17.4.16. J3 Malfunction
Malfunction decision conditions
When the voltage signal that IPM send to compressor drive chip is abnormal, the
display LED will show “J3” and AC will turn off.
Supposed causes
● Wiring mistake
● Faulty IPM board
● Faulty outdoor fan ass’y
● Compressor malfunction
● Faulty outdoor PCB
At first test the resistance between every two ports of U, V, W of IPM and P, N. If any result of them is 0
or close to 0, the IPM is defective. Otherwise, please follow the procedure below:
J3 display
J3 display
PFC module protection
PFC module protection
Check whether the
connecting line between
main board and the PFC
module is connected tightly
Check whether the
connecting line between
main board and the PFC
module is connected tightly
Yes
Measure whether the voltage
between P and N is normal
refer to the Appendix 3？
Measure whether the voltage
between P and N is normal
refer to the Appendix 3？
No
Check whether the
inductance of PFC module
is good? If the inductance is
good, the resistance of the
two ports is 0
Check whether the
inductance of PFC module
is good? If the inductance is
good, the resistance of the
two ports is 0
Yes
Replace the inductance
Replace the inductanceNo
Connect it tightly, check
normal or not
Connect it tightly, check
normal or not
Replace the outdoor main board
Replace the outdoor main boardYes
Yes
No
No
Replace the PFC module
Replace the PFC module
Trouble is solved
Trouble is solved

Midea MCA3U-09HRFN1-M(C) Specifications

General

Brand	Midea
Model	MCA3U-09HRFN1-M(C)
Category	Air Conditioner
Language	English