Check code
4210
(UP)
Compressor overcurrent interruption
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Diagnosis
Remedy
Chart 2 of 2
No
Yes
Yes
No
Yes
Yes
No
Yes
No
No
Are they connected properly?
Connect the compressor wiring (U, V and
W phase) properly, then turn the power
back ON.
Continued from the previous page
Does it operate normally?
Are those units short-cycled?
Are the voltage among the phases
U-V, V-W and W-U different?
Does it operate normally?
Check the DC fan motor.
Remove factor(s) causing the short-cycle.
Replace the compressor.
Replace the outdoor power circuit board.
Complete
Check the operation of indoor/outdoor fan
motors.
Check for indoor/outdoor short-cycle.
Disconnect the compressor wiring from the outdoor
power circuit board, then check the voltage among
each phases U, V and W during test run (SW7-1 ON).
Make sure to perform a voltage
check with the same performing
frequencies.
Replace the outdoor multi controller circuit
board.
(short-cycled)
(no short-cycled)
67
OCH668B
