System low pressure
ratio protection
Restart the system and test the
pressure at the valve of the
high pressure and low
pressure pipe.
Compare the tested
valve with that tested
by the software
Is the difference in the high
pressure larger than 5 Celsius
degree?
Is the difference in the low
pressure larger than Celsius
degree?
The high pressure
sensor broken.
Replace the sensor
The low pressure
sensor is broken.
Replace the sensor
Does the outdoor unit's four-way
valve reverse properly?
Replace the four-way
valve
Are the electronic expansion valves
of the indoor and outdoor units
working properly?
Check electronic
expansion valves
Does the indoor unit's four-way valve
reverse properly?
The system pipeline is
connected incorrectly
Check connection of
the high- and
low-pressure pipes
NO
YES
YES
YES
Replace the four-way
valve
YES
YES
NO
NO
NO
NO
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