Troubleshooting 23
7.7 P6/PC 03 (High pressure protection)
Description: If the current is less than setting value for 4 seconds, AC shuts off and restarts after 3 minutes in cooling
mode or after 4 minutes in heating mode. If this happens 8 times, the unit stops and the LED displays the failure code.
Recommended parts to prepare:
• System blockages
• Dirty condenser
Troubleshooting and repair:
High
pressure protection
Is the outdoor
ambient temperature is higher
than 54℃?
Stop the unit.YES
Check if the outdoor unit
ventilation is good
.
NO
Is it good?
Ensure that the outdoor unit
ventilation is functioning properly.
NO
Check the outdoor fan.
YES
Is it running properly?
Please refer to the solution of fan speed
has been out of control malfunction . Find
out the cause and have it solved.
NO
Check the heat exchanger.
YES
Is it dirty?
Clean the heat exchanger.YES
Check the high and low pressure value.
NO
Are they open?
Fully open the high or low
pressure values.
NO
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