Haier HSU12 - Power Supply over or under Voltagve Fault

7.3.9 Power Supply Over or under voltagve fault
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Indoor display F19
outdoor display: LED1 flash 6 times
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Method of An abnormal voltage rise or fall is detected by checking the specified voltage detection
circuit.
Malfunction
Detection
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Malfunction An voltage signal is fed from the voltage detection circuit to the microcomputer
Decision
Conditions
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Supposed
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Supply voltage not as specified
Causes
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the IPM module is broken
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the outdoor PCB is broken
T roubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector,
or else parts damage may be occurred.
About how to check the IPM module,please refer to IPM protection fault
This question may be caused by the
power
Change the new one
Change the outdoor PCB
Check the power supply
Is it rated power?
No
Yes
Check the IPM
module
Is it normal?
No
Yes
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Domestic Air Conditioner
HSU12/18VHJ(DB)
Functions and control
66