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SERVICE MANUAL
R
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410A Ductless Split System: DLF4(A/H), DLC4(A/H)
421 08 9204 00
61
(2) IPM Protection, Out
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of
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step Fault, Compressor Phase Over current (AP1 below refers to the outdoor control panel)
Main check points:
Is the connection between control panel AP1 and com-
pressor COMP secure? Loose? Is the connection in
correct order?
Is the voltage input of the machine within normal
range? (Use AC voltmeter to measure the voltage
between terminal L and N on the wiring board XT)
Is the compressor coil resistance normal? Is the insula-
tion of compressor coil against the copper tube in good
condition?
Is the working load of the machine too high?
Is the charge volume of refrigerant correct?
Fault diagnosis process: