Samsung SH12VCD Service Manual page 27

Troubleshooting
5-3-9 Check of instantaneous over-current protection of IPM circuit.
Inverter instantaneous over-current protection mode is the mode to be actuated in order to
prevent the damage of elements from the peak current of IPM circuit elements.
In case that the inverter circuit instantaneous over-current protection mode actuates, check
the following items.
(Condition of installation)
♦The ventilation is not good because the outdoor unit is installed wrong (the ambient
temperature is higher than 50 (°C) )
→ Reinstall the outdoor unit so that the good ventilation can be made.
♦In case that the operation is made with the cover bent of the outdoor unit.
→ Take out the cover.
♦If two outdoor units are operating face to face, (the bad ventilation is made)
→ Reinstall the outdoor unit for the good ventilation.
♦The air circulation is bad due to the attachment of falling leaves.
→ Take away the leaves for the good ventilation.
♦If the Refrigerant is overcharged.
→ Check the amount of Refrigerant.
(Unit defect)
♦If the comp is locked.
→ Replace the comp.
♦If the comp is operating without the revolution of fan motor.
→ Check the fan motor connector and replace the fan motor.
♦In case the parts of the control board is damaged.
→ Replace simultaneously the inverter control board.
5-3-10 Check of the comp discharge gas temperature and OLP temperature abnormal rise.
If the comp discharge gas temperature and OLP temperature rises higher than a certain level,
it protects the circuit.
If the comp discharge gas temperature and OLP temperature rises abnormally, check the
following items.
(Condition of installation)
♦The ventilation is not good because the outdoor unit is installed wrong (the ambient
temperature is higher than 50 (°C) )
→ Reinstall the outdoor unit so that the good ventilation can be made.
♦In case that the operation is made with the cover bent of the outdoor unit.
→ Take out the cover.
♦If two outdoor units are operating face to face, (the bad ventilation is made)
→ Reinstall the outdoor unit for the good ventilation.
♦The air circulation is bad due to the attachment of falling leaves
→ Take away the leaves for the good ventilation.
♦If the refrigerant is insufficient.
→ Fill up the amount of refrigerant.
(Unit defect)
♦If the comp is locked.
→ Replace the comp.
♦If the comp is operating without the revolution of fan motor
→ Take out the protection cover.
→ Check the fan motor connector and replace the fan motor.
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