Gree LSQWRF35VM/NaA-M Service Manual page 73

(2) Low pressure protection
Test Operation, Troubleshooting and Maintenance
Low pressure protection
Yes
Does the water pump
not started or the flow is
inadequate ?
No
Does the electric
expansion valve work
normally ?
Yes
Is the pressure switch
damaged or is the wiring
loosened?
No
Is scale formed inside
the shell and tube?
No
Are water pipes designed
improperly? The flow becomes
smaller when the terminal unit
is turned off.
No
Does refrigerant leak?
No
Does the controller
alarm incorrectly?
No
Contact the supplier.
Yes Check the water pump.
Replace the coils of the
No electric expansion valve
or even the main body
Replace the pressure switch
Yes
or rewire it .
Yes Clean the exchanger.
Yes Adjust the water pipes.
Do the leak test. Then add
Yes
refrigerant.
If this occurs frequently, the
Yes main board should be
replaced.
69
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