Gree A Series Service Manual page 109

A Series Modular-type Air-cooled (Heat Pump) Chiller
Error Name
Temperature sensor
protection
Communication error
Phase loss/reversal
protection
Protection for the water flow
switch
Error Source
Temperature sensor
Main board
Phase protector
Contact
104
Protection Logic
When the entering water
temperature fails, all
compressors and fans of the
corresponding single unit will
stop. When the discharge
temperature sensor fails, the
display panels will tell
"Discharge temperature
sensor X error". In this case,
the unit can be started
normally only when it has
been unlocked. When the
antifreeze temperature
sensor or leaving water
temperature sensor fails, the
display panel will display this
error. In this case, the unit
can resume normal
operation only when this
error has been cleared
manually.
When the single unit fails to
receive signals from the
control panel, it will
automatically be shut off.
When phase loss/reversal
occurs, the phase protector
will cut off the power supply
to the main board.
When a single unit detects
its flow switch is open, this
module will automatically be
shut down. When all flow
switches are closed, the
water pump will stop.