System high
pressure ratio
protection
Restart the system and test the
pressure at the valve of the
high pressure and low
pressure pipe.
Compare the tested
value with that tested
by software
Is the difference in the high
pressure larger than 5 Celsius
degrees?
Is the difference in the low
pressure larger than 5 Celsius
degrees?
The high pressure
sensor is broken.
Replace the sensor
The low pressure
sensor is broken.
Replace the sensor
Is the outdoor unit's fan working
properly according to the testing
software?
Replace the driver
plate of the fan
Is the outdoor unit's fan still
abnormal?
Replace the fan motor
Are the electronic expansion valves
of the outdoor and indoor units
working properly?
Check the electronic
expansion valve
If the outdoor unit's valve fully
opened?
The system's pipeline is
blocked
Check the system's
pipeline
NO
YES
YES
YES
YES
Fully open the valve
YES
YES
NO
NO
NO
NO
NO
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