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4. Trouble Shooting
Items Contents
Purpose
Protection of the IPM parts and compressor in the PCB assembly from
over-current.
Condition for Generation Generation when over-current is detected in IPM.
Expected
Causes
Installation &
Overload
Outdoor device shielding, closing of a SVC valve, under/over charging
of refrigerant, infiltration of water into refrigerant, outdoor fan fault, EEV
(Electric Expansion Valve) fault, fault of a temperature sensor or its con-
nection, blocking of an indoor device filter, and bending/blocking of a
pipe.
Compressor
Open/Short of the coil in the compressor, insulation breaking between
the coil in the compressor and the pipe or panel, damage of compressor
with abrasion, and compressor connection fault.
PCB As-
sembly
IPM part fault, fault-signal detection circuit fault, compressor current
detection circuit fault, and DC link detection circuit fault.
Others
Improper power input, IPM connection fault, and insufficient distance
between heat sink and control panel.
6.7 Troubleshooting Outdoor Error
CH 21 (DC Peak / Comp IPM Fault)
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