Troubleshooting
9.2.3.2 IPM protection, desynchronizing malfunction, phase current of compressor is overcurrent (outdoor unit
malfunction)
Indoor display:
H5 (dual-8 display), heating indicator is off for 3S and blinks 5 times.
P5 (dual-8 display), heating indicator is off for 3S and blinks 15 times.
H7 (dual-8 display), heating indicator is off for 3S and blinks 7 times.
Main detection points:
z Are control board AP1 and compressor COMP well connected? Are they loosened? Is the connection sequence
correct?
z Is voltage input in the normal range (Test the voltage between LǃN of wiring board XT by DC voltage meter)?
z Is coil resistance of compressor normal? Is there reliable insulation between compressor coil and copper tube?
z Is the work load of unit heavy? Is radiating of unit OK?
z Is the refrigerant charging appropriate?
Malfunction diagnosis process:
47
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